Tuesday, September 5, 2017

The pioneering continent

ARE small cargo drones the answer to some of Africa’s most pressing problems? A group of European engineers supported by IBM thinks so. Christened “flying donkeys” and now in development, the drones will carry 10kg (22 pounds) of cargo each over distances of up to 120km (75 miles) to supply medicine to remote communities or food to refugees.

 They are designed to be cheap and rugged enough to deploy across the continent, and could perhaps serve as a proving ground for retailers like Amazon that are unable to experiment as freely in the rich world because of strict regulations. Test flights are planned in Africa for later this year. The continent is regarded as an ideal arena because its airspace is not congested, and because poor roads mean that demand for cheap air cargo is immense.

Experiments such as this underscore a remarkable change taking place in Africa. A continent that has long accepted technological hand-me-downs from the West is increasingly innovating for itself. To be sure, much of this is made possible by technological advances elsewhere. Mobile phones are common today in even the most remote African villages. Ericsson, a technology company, estimates that the number of mobiles will rise to 930m by 2019, almost one per African. The spread of smartphones, some of which now cost as little as $25, is likely to push internet penetration to 50% within a decade.

This is now allowing Africans to go beyond merely copying technology used elsewhere or adapting it to fit African circumstances. In some cases, firms are generating innovations that can also be used in rich countries. Mobile money is the best example. A technology that long struggled to gain a foothold in the West (though mobile payments now seem to be taking off after the introduction of Apple Pay) has transformed economies in places such as Kenya, where millions of unbanked people have been brought into the financial system. This in turn has spurred yet another wave of innovation.

Firms are using mobile money to sell life-insurance policies, some to people with infections such as HIV. Phones not only reduce the cost of collecting small premiums but also allow insurers to remind customers to take their medicine. Another innovator is Olam, a Singapore-listed farm-commodity firm. It has signed up 30,000 farmers in Tanzania as suppliers of coffee, cotton and cocoa through a mobile-phone system, boosting profitability for all.

New technologies could also make a great difference in education. Although firms around the world are developing smartphone and iPad apps to teach children to read, write and do sums, these innovations promise to have a far greater impact in Africa, where education systems are weak and children often have to walk long distances or pay prohibitive fees to attend school.

Apps and e-learning schools are no match for the best state or private ones, but only a tiny elite has access to those. Compared with the run-of-the-mill schools that most Africans attend, they look impressive. The main advantage of using technology to teach is that it reduces the impact of two common failings in many ordinary schools in Africa: teacher absenteeism and minimal adherence to the curriculum. Among the firms embracing such innovation is Bridge International Academies, partly funded by Pearson, co-owner of The Economist. It has more than 100,000 nursery and primary pupils in Kenya, paying about $5 a month to attend low-cost schools that use technology to follow standardised curriculums.

Technology companies are also having an impact on African societies by transforming the media. The 300,000 residents of the Kenyan city of Nakuru have never had their own newspaper, relying instead on word of mouth for local news. That changed last year when a news website, HiviSasa (meaning “Right Now”), started publishing 30 reports a day on fires, murders, school graduations, hospital improvements and much else that few people outside Nakuru would care about. On March 13th its headline read, “Teacher rescued from 45-feet toilet”.

Innovation in Africa is helped by a peculiar confluence of economic and political circumstances. Regulation is generally light thanks to weak governance; engineers can try things out that are either prohibited or prohibitively bureaucratic elsewhere. It is also buoyed by the paucity of traditional infrastructure, whether roads or landlines, meaning that new technologies or business models face few established competitors.
This business environment has attracted a growing number of Western companies to Africa. Microsoft is funding a small firm that is developing wide-area Wi-Fi systems able to cover entire regions at less than a hundredth of the cost of existing mobile telephony. It uses unallocated frequencies, including ones previously reserved for television that are being freed up as broadcasters move to digital transmissions that use less bandwidth. The intention is to bring the same model to rural communities in the West.

Technology is opening up African markets that have long been closed or did not previously exist, says Jim Forster, one of the early engineers at Cisco, a maker of network gear, and now an angel investor. Facebook has joined up with phone operators to make internet connectivity available free through an initiative known as internet.org, hoping to sign up Africans to its site before indigenous social media get to them. Launched in Africa last year, it has since been expanded to poor countries on other continents. Of all Western technology firms, IBM is perhaps the keenest on Africa. Virginia Rometty, the head, visits regularly and talks of “great, great innovation” coming out of the continent.

Africa’s innovation revolution is still in its infancy. But it is likely to gain pace, not least because new models and forms of financing start-ups are also being developed. Take EmergingCrowd, a London-based crowdfunding firm that was launched this week. It aims to match investors with companies in emerging markets, predominantly in Africa. One of the first firms to raise money on it is Bozza, a market for African music and film producers who would otherwise struggle sell their work. “The problems Africa faces are not necessarily American or European problems,” says Emma Kaye, its founder. “The solutions are likely to come out of Africa.

Advancements & Achievements


By Rowan Philp
A South African research center—the Council for Scientific and Industrial Research (CSIR)—was the driving force behind the world’s lithium batteries, from those in your laptop to cell phones and the Chevy Volt, in addition to the time machine now used by the world’s leading road engineers.
And the SABLE Accelerator understands that South Africa’s CSIR, a government- and private sector-funded research and innovation hub, has just made a major global breakthrough in laser technology, which could help shape the future as fundamentally as the “tube” behind television.
This technology was developed by the CSIR's National Laser Centre and is the world's first digital laser, which allows the laser beam to be manipulated into multiple shapes, whereas traditional lasers appear only as a small point. While it is still being refined, this multifunctional technology will ultimately simplify numerous applications and will have implications across a number of industries. Watch the video below to learn more.
In June 2013, the CSIR's National Laser Centre also invented the flame lens—a system that literally uses fire to focus powerful laser beams that would otherwise destroy conventional glass lenses.

Focusing the brainpower of 2,500 scientists, inventors and developers, the CSIR has quietly, over the past 68 years, developed everything from the world’s first injectable plant-produced medicine and a satellite-based fire warning system to aircraft design tools and a low-cost computer for the blind. Yet many promising inventions are literally sitting on the shelves of its sprawling Pretoria campus, waiting for the entrepreneurial catalyst needed to convert inventions into innovations and improve lives around the globe.
In a world first, the CSIR has invented a system that cheaply prevents train derailments by monitoring the entire track with guided ultrasound waves. A pilot unit on two lines in South Africa prevented two inevitable derailments in a single year, according to the CSIR, which listed the average cost of each derailment at $5 million. But this solar-powered breakthrough technology—which does not interfere with train operation—still awaits a commercial partner to go to market.

With an annual turnover of roughly $200 million, income from about 30 active technology licensing agreements was $2 million last year. About 12 new license agreements are concluded annually. According to its new Head of Technology Transfer, Dr. Sean Moolman, this was in line with the international R&D institution benchmark of 1 to 3 percent but remains at the lower end.

Some $130 million (roughly 70 percent) of the research center’s turnover is derived from contract R&D funding. However, Moolman said a major push was underway to increase the rate of start-up formation and licensing activity to commercialize a raft of new technologies.
Recently launched start-up companies include ReSyn Biosciences, offering highly customizable and ultra-high-performance microspheres for life sciences research; Tuluntulu, a company with a low-bandwidth adaptive video streaming technology platform for the developing world; and Persomics, which offers a platform for miniaturized high-throughput screening and experiments.

Moolman said it was also long overdue that South African funders, stakeholders the general public, foreign investors and strategic partners be made aware of the keen cutting-edge technology innovation at the southern tip of Africa.


A Little-Known Legacy of World-Class Innovation

Ask average South African businesspeople what their country has invented, and a
handful might suggest the automated pool cleaner and the CT scan. In fact, the list runs to dozens of major breakthroughs, including CSIR inventions like the Tellurometer, the world’s first microwave distance-measuring instrument. In medical research alone, South African innovations include electron

crystallography, epigenetic therapy for blood cancers, the human heart transplant and the first barrier to STD transmission—including HIV—for women).



Ask the same group in what research areas their country is a world leader, and some might suggest banking and mining technologies and perhaps vaccines. In fact, South Africa is a world leader in everything from cell culturing to micro-satellites and the technologies of light—a core innovation hub for the CSIR.

At the most exotic end of this field, the council’s laser research group has developed devices that compete at the leading edge of the global industry, particularly in the mid-infrared range, which has applications for everything from surgery to protecting aircraft from heat-seeking missiles. It has formed a partnership with the world’s most famous optics maker, Carl Zeiss, in customizing its laser devices for next-generation missile guidance.

SABLE understands that the team has also invented a brand-new kind of laser, which promises to have a major impact in laser characterization and in fiber-optic communications. Moolman declined to provide details on the breakthrough, saying a major announcement on the implications is due to be made by the government in the weeks to come. However, he did note, “These guys are doing absolutely amazing things—they already have more than five world records for laser performance.”

The Companies Spinning Off From CSIR Innovation
Another new spin-off company, UViRCO, now leads the world in a multispectral imaging technology that was entirely invented by South Africans: the ability to detect the corona electricity leakage from power lines and sub-stations.

CEO Dirk Lindeque told SABLE the new company had already sold 320 imaging cameras and 20 large multi-cam devices to power utilities and universities from China to South America. However, the journey from invention to profitability has taken 20 years. Lindeque was a research team leader and part of a team who invented the world’s first night time corona imaging device in 1991, with a second full daylight version created in 1993.

But Lindeque said utilities were increasingly recognizing the cost and energy savings behind identifying leakages and potential blackout damage, and he noted that UViRCO’s engineers were now developing a tool to accurately quantify the losses.

And in yet another light-related technology, the CSIR has commercialized the CANDLE portable landing light system, in which remote-controlled visible or infrared lights are placed for disaster relief aircraft or military paratroopers. Already used by a number of defense forces—and having won an International Soldier Technology Award (2006)—an upgraded version incorporating an early warning system is now ready for licensing with industrial partners and military contractors.










However, if South Africa is to be known for the new light of lasers in the future, its greatest scientific pedigree currently is the technology to unlock the oldest light in the universe—not just the visible light of the most distant galaxies, but light so old that it has been stretched into microwaves and radio waves.
Already home to the world’s most powerful single optical telescope—the locally designed, 10.5-meter Southern African Large Telescope—South Africa is now leading the development of the world’s largest telescope of any kind, the Square Kilometer Array. Local scientists are currently building 64 locally invented radio dishes for the SKA’s precursor, the MeerKAT array, following a massive materials testing process by the CSIR.

Beyond the engineering of light, the CSIR’s portfolio of innovation extends to metal casting, technologies for poverty eradication and the life sciences. Moolman said the Persomics start-up could revolutionize DNA screening and be a core enabler for personal genomics.
Resyn Biosciences, the Pretoria-based start-up, enters the highly competitive world of “bead” biotechnologies, in which tiny artificial particles are coated with a variety of substances for medical and research use.

While existing companies offer solid or cracked micro beads, Dr. Justin Jordaan, a team leader behind the company’s patented design, says Resyn technology featured a polymer matrix with vastly higher surface area for absorption. The beads are also the first to use a compound called PEI as the primary ingredient of the matrix tangle. And, says Jordaan, the patented microspheres are magnetic, which means they can be separated from a substance they’re immersed in, like blood, simply with the use of a magnet.

Bridging the Gap Between Breakthrough and Business
In a recent article on the technology transfer effort, CSIR CEO Sibusiso Sibisi suggested, “Arguably, one of the biggest impacts CSIR research has had on an industry is in the development of the lithium ion battery, which has literally changed the world. All major manufacturers have been licensees of CSIR intellectual property.”

In the 1980s, CSIR researchers Mike Thackeray and Johan Coetzer developed spinel and other technologies, which are now fundamental to high-power, rechargeable batteries. Royalties have flowed ever since. However, in the 1990s, the CSIR and its funders at Anglo American made the ill-fated decision to suspend the development of the batteries, leaving the U.S. and others to inherit a future lithium economy worth untold billions.


 












In a recent paper, Thackeray lamented his mistake, saying, “One cannot help but wonder what would have happened if Anglo and CSIR had decided to invest in lithium battery technologies over the long term.”
Instead, it has been innovations like the Heavy Vehicle Simulator (HVS) that have led to income for the institute. Developed in the 1980s, the HVS was the world’s first—and still leading—accelerated pavement tester, a virtual time machine that precisely simulates, within three months, what a stretch of road will look like after 20 years of traffic and weather. Now undergoing a revolutionary seventh iteration, the HVS is a 55-ton machine that forces a truck bogie onto a road surface under tons of pressure and runs it back and forth across a 12-meter track. It also features finely tuned simulations for extreme heat, cold and weather, in addition to intensive data analysis support to customers.

The California Department of Transportation uses two of the massive units to plan the complex recipe of asphalt, gravel and other layers for its roads. Chris Rust, the original pioneer of the simulator, told SABLE that 12 of the $2 million units have been sold, in addition to double-sized $4 million versions for aircraft runway testing for the US military and FAA.

“We used to sell one every two years; now it’s three each year, and we currently have three being built with three more in the pipeline,” he says. Rust said one of the invention’s unique features was that it was mobile and used on actual roads rather than test strips. And now, 20 years after the roll-out of the unit’s commercial version, simulated wear-and-tear can be compared to actual damage done over 20 years of traffic and weather.

Rust said California road officials were stunned when shown photographs of a 1992 HVS test strip alongside photographs of that same road taken last year. “The conditions were the same!” says Rust. The time machine had passed its ultimate test. He said the latest version would triple the simulation speed while dramatically reducing cost and size by removing all hydraulic systems from the unit. Rust could not reveal details of the patented mechanism, which would replace the hydraulic motors.

If the process can be imagined like a circular pizza knife being pressed through a pizza, the new system is to drive a set of wheels into roads with the pressure of 40 tons, at a speed of 40 kilometers per hour, for weeks on end.
South African innovation springs from eight publically funded science research councils, universities and the private sector. But the CSIR remains the engine behind the national effort.

According to the government’s 10-Year Innovation Plan, by 2018 South Africa should: be one of the top three emerging economies in the global pharmaceutical industry; deploy multiple space satellites, including at least one launched from its own territory; and achieve a 25-percent share of the global hydrogen and fuel cell catalysts market with novel platinum group catalysts.

The Completed CSIR Innovations Awaiting Partners
Some of the CSIR’s ready-for-transfer technologies appear to hold promise to contribute to South Africa's lofty innovation goals. Some of these include:
  • A wireless mesh technology that provides affordable Internet connectivity to rural villages. Already rolled out to 185 rural schools in a pilot project in South Africa, Broadband 4 All uses low-cost local infrastructure and peer-to-peer communication rather than the traditional point-to-multi-point model. The system assigns clusters of schools to village operators within a network designed for resilience and even cultural acceptance. The model is currently inviting expressions of interest from potential commercial partners.
  • The world’s first risk-free bioreactor. While most cell culturing is a 2D process in a petri dish or on 3D scaffolds in which delicate cells can be damaged when removed, the CSIR’s invention effectively detaches the cells with the flick of a temperature switch, allowing the cells to safely float off their mounts. 
  • A low-cost maternal ultrasound device, called Umbiflow, which uses Doppler technology to detect small-size fetuses that need intervention at rural and primary care facilities. With nine out of 10 pregnant mothers unnecessarily referred to hospitals using current fetal measurement techniques in the developing world, the CSIR invention—by measuring umbilical blood flow—identifies the 10 percent of cases in which small-for-gestational-age fetuses are unhealthy and in need of hospital intervention. The system has also been credited with preventing perinatal deaths by up to 38 percent while reducing costs for mothers and hospitals.
  • A bio-artificial liver support system, which channels patient’s blood through a liver cell bio-reactor using a unique emulsion carrier. This patented system has potential applications in tissue engineering, 3D cell culturing and lifesaving therapies.
  • Rheostat semi-solid metal casting, a potential environmentally friendly solution to making everything from aerospace components to bicycle frames and prosthetics. The patented system from the institute’s advanced casting technologies group allows lightweight metal components to be cooled and cast into their final shape in a single step while recycling unused metal and reducing scrap to under 5 percent—a level not yet achieved in the global casting industry.

About the CSIR
The CSIR is one of the leading scientific and technology research, development and implementation organizations in Africa. Constituted by an Act of Parliament in 1945 as a science council, the CSIR undertakes directed and multidisciplinary research, technological innovation, as well as industrial and scientific development to improve the quality of life of the country’s people.

The CSIR is committed to supporting innovation in South Africa to improve national competitiveness in the global economy. Science and technology services and solutions are provided in support of various stakeholders, and opportunities are identified where new technologies can be further developed and exploited in the private and public sectors for commercial and social benefit.
The CSIR’s shareholder is the South African Parliament, held in proxy by the Minister of Science and Technology. More information is available at http://www.csir.co.za.

Bio
Rowan Philp served as Chief Reporter and Foreign Correspondent for the Sunday Times in South Africa for most of the past decade—a period broken by stints at the Washington Post as Deputy News Editor; a Harvard/MIT fellowship; and two years as London Bureau Chief. Previously, he was based in Boston and served as the North American correspondent for the Sunday Times and Mail & Guardian, reporting on South African expatriates and diplomats, as well science and innovation. He isa currently chief reporter in South Africa for The Witness daily newspaper of KwaZulu-Natal and Media24.

In his 20-year career, Philp has reported from 27 countries around the world, from Haiti and Libya to the civil war in the Philippines and the World Economic Forum at Davos, as well as covering the past four US presidential elections. He has twice been awarded South Africa’s highest national print reporting prize, the Vodacom South African Journalist of the Year

Consolidated African Technologies (Pty) Ltd

Company profile

CAT was established in 1990 and has been a leading provider of ultra-rugged data collection solutions since its establishment.
Our systems are installed at over 450 sites throughout Africa in Botswana, Cameroon, Lesotho, Kenya, Malawi, Mali, Namibia, Nigeria, Rwanda, Swaziland, South Africa, Tanzania and Zambia.
 We have sold in excess of 11000 ultra-rugged handheld computers and are widely known as the leading meter reading solutions provider throughout the continent of Africa.

Other data collection systems have also been developed in house and CAT is a one stop shop when it comes to data collection in hazardous or extreme environments.

CAT’s software is also setting the trend as far as meter reading solutions are concerned and the features and functions available within our systems is much more elaborate and
user focused than those available anywhere else. Powerful reporting and behaviour driven meter reading processes ensure that the quality of meter reading data returned by a
CAT system far surpasses anything collected by any other method.

New to the market of monitoring dispensing of fuel from company and government depots as well as mobile refuelling trucks CAT is fast expanding our business into this arena as well.
Our solutions provide an easy way to ensure that fuel is only dispensed into authorised vehicles, containers and tools.

Cat truly is a one stop shop for any data collection or monitoring needs in outdoor, extreme and hazardous environments.

Product & services

CAT specializes in data collection, assessment and monitoring for extreme or hazardous environment applications. These can include anything from meter reading to tracking of assets in mines and on railways to monitoring dispensing of fuel or cathodic protection on major pipelines.

CAT’s Enterprise Meter Reading Software dubbed Routemaster Africa.Net is our flagship product and in conjunction with the Radix range of ultra-rugged handheld equipment and user friendly function rich mobile software forms the ultimate meter reading solution.

Additional technologies such as Smart AMR (Automated Meter Reading), Walk by AMR, GPS, Remote communications via 3G/GPRS, Bluetooth printing, in field integrated imaging can modularly be added to build a perfect system to user requirements and budget

Mogale City - Over 21 years of service





CAT has been awarded the tender for an upgrade to and refresh of the current
meter reading software and hardware in use at their sites. The original system
was supplied by CAT in 1993 and even though additional devices was purchased
since and the odd software update done it is still the same Radix FW60
technology operating there today as was originally implemented in 1993. This
officially makes Mogale City (previously known as Krugersdorp Municipality)
the client that has operated a single technology for the longest time - 21 years.
CAT Meter Reading Systems - There for the long run.

Great achievements in science and technology in ancient Africa


Despite suffering through the horrific system of slavery, sharecropping and the Jim Crow era, early African-Americans made countless contributions to science and technology. This lineage and culture of achievement, though, emerged at least 40,000 years ago in Africa. Unfortunately, few of us are aware of these accomplishments, as the history of Africa, beyond ancient Egypt, is seldom publicized.

Sadly, the vast majority of discussions on the origins of science include only the Greeks, Romans and other whites. But in fact most of their discoveries came thousands of years after African developments. While the remarkable black civilization in Egypt remains alluring, there was sophistication and impressive inventions throughout ancient sub-Saharan Africa as well. There are just a handful of scholars in this area. The most prolific is the late Ivan Van Sertima, an associate professor at Rutgers University. He once poignantly wrote that “the nerve of the world has been deadened for centuries to the vibrations of African genius”

Here, I attempt to send an electrical impulse to this long-deadened nerve. I can only fly by this vast plane of achievements. Despite this, it still should be evident that the ancient people of Africa, like so many other ancients of the world, definitely had their genius.

Math
Surely only a few of us know that many modern high-school-level concepts in mathematics first were developed in Africa, as was the first method of counting. More than 35,000 years ago, Egyptians scripted textbooks about math that included division and multiplication of fractions and geometric formulas to calculate the area and volume of shapes.


Distances and angles were calculated, algebraic equations were solved and mathematically based predictions were made of the size of floods of the Nile. The ancient Egyptians considered a circle to have 360 degrees and estimated Π at 3.16

Eight thousand years ago, people in present-day Zaire developed their own numeration system, as did Yoruba people in what is now Nigeria. The Yoruba system was based on units of 20 (instead of 10) and required an impressive amount of subtraction to identify different numbers. Scholars have lauded this system, as it required much abstract reasoning

Astronomy
Several ancient African cultures birthed discoveries in astronomy. Many of these are foundations on which we still rely, and some were so advanced that their mode of discovery still cannot be understood. Egyptians charted the movement of the sun and constellations and the cycles of the moon. They divided the year into 12 parts and developed a yearlong calendar system containing 365 ¼ days. Clocks were made with moving water and sundial-like clocks were used

A structure known as the African Stonehenge in present-day Kenya (constructed around 300 B.C.) was a remarkably accurate calendar (5). The Dogon people of Mali amassed a wealth of detailed astronomical observations (6). Many of their discoveries were so advanced that some modern scholars credit their discoveries instead to space aliens or unknown European travelers, even though the Dogon culture is steeped in ceremonial tradition centered on several space events.

The Dogon knew of Saturn’s rings, Jupiter’s moons, the spiral structure of the Milky Way and the orbit of the Sirius star system. Hundreds of years ago, they plotted orbits in this system accurately through the year 1990 (6). They knew this system contained a primary star and a secondary star (now called Sirius B) of immense density and not visible to the naked eye.

Metallurgy and tools
Many advances in metallurgy and tool making were made across the entirety of ancient Africa. These include steam engines, metal chisels and saws, copper and iron tools and weapons, nails, glue, carbon steel and bronze weapons and art

Advances in Tanzania, Rwanda and Uganda between 1,500 and 2,000 years ago surpassed those of Europeans then and were astonishing to Europeans when they learned of them. Ancient Tanzanian furnaces could reach 1,800°C — 200 to 400°C warmer than those of the Romans (8).

Architecture and engineering
Various past African societies created sophisticated built environments. Of course, there are the engineering feats of the Egyptians: the bafflingly raised obelisks and the more than 80 pyramids. The largest of the pyramids covers 13 acres and is made of 2.25 million blocks of stone .

Later, in the 12th century and much farther south, there were hundreds of great cities in Zimbabwe and Mozambique. There, massive stone complexes were the hubs of cities. One included a 250-meter-long, 15,000-ton curved granite wall (9). The cities featured huge castlelike compounds with numerous rooms for specific tasks, such as iron-smithing. In the 13th century, the empire of Mali boasted impressive cities, including Timbuktu, with grand palaces, mosques and universities

Medicine
Many treatments we use today were employed by several ancient peoples throughout Africa. Before the European invasion of Africa, medicine in what is now Egypt, Nigeria and South Africa, to name just a few places, was more advanced than medicine in Europe. Some of these practices were the use of plants with salicylic acid for pain (as in aspirin), kaolin for diarrhea (as in Kaopectate), and extracts that were confirmed in the 20th century to kill Gram positive bacteria.

Other plants used had anticancer properties, caused abortion and treated malaria — and these have been shown to be as effective as many modern-day Western treatments. Furthermore, Africans discovered ouabain, capsicum, physostigmine and reserpine. Medical procedures performed in ancient Africa before they were performed in Europe include vaccination, autopsy, limb traction and broken bone setting, bullet removal, brain surgery, skin grafting, filling of dental cavities, installation of false teeth, what is now known as Caesarean section, anesthesia and tissue cauterization. In addition, African cultures preformed surgeries under antiseptic conditions universally when this concept was only emerging in Europe

Navigation
Most of us learn that Europeans were the first to sail to the Americas. However, several lines of evidence suggest that ancient Africans sailed to South America and Asia hundreds of years before Europeans. Thousands of miles of waterways across Africa were trade routes. Many ancient societies in Africa built a variety of boats, including small reed-based vessels, sailboats and grander structures with many cabins and even cooking facilities. The Mali and Songhai built boats 100 feet long and 13 feet wide that could carry up to 80 tons

Currents in the Atlantic Ocean flow from this part of West Africa to South America. Genetic evidence from plants and descriptions and art from societies inhabiting South America at the time suggest small numbers of West Africans sailed to the east coast of South America and remained there

Contemporary scientists have reconstructed these ancient vessels and their fishing gear and have completed the transatlantic voyage successfully. Around the same time as they were sailing to South America, the 13th century, these ancient peoples also sailed to China and back, carrying elephants as cargo

People of African descent come from ancient, rich and elaborate cultures that created a wealth of technologies in many areas. Hopefully, over time, there will be more studies in this area and more people will know of these great achievements

Africa’s digital revolution: a look at the technologies, trends and people driving it

Businessman Remigius Okafor stands by his store in front of a advertisment for the mobile banking service Airtel Money along Lumley Street in the Sierra Leonean capital Freetown,  
We are at the dawn of a technological revolution that will change almost every part of our lives – jobs, relationships, economies, industries and entire regions. It promises to be, as Professor Klaus Schwab has written, “a transformation unlike anything humankind has experienced before”.

In no place is that more true than Africa, a continent that has yet to see all the benefits of previous industrial revolutions. Today, only 40% of Africans have a reliable energy supply, and just 20% of people on the continent have internet access.
 African countries with a majority living without electricity
And yet, with all of Africa’s unique resources – from its young and growing labour force to its largely untapped internal markets – this coming digital revolution offers unprecedented opportunities. From 11 to 13 May, it’s these opportunities that we’ll be exploring in Kigali with some of the region’s leading minds in business, politics and academia.

Ahead of the meeting, we’re launching a series of articles that will provide some context on the different issues being discussed.
Africa’s digital and cultural revolution
If steam engines, electricity and IT were what defined the previous three industrial revolutions, this latest one is powered by a whole range of exponential technologies that have the potential to change the world as we know it.

“As the continent transitions from the margins to the mainstream of the global economy, technology is playing an increasingly significant role,” says Jake Bright in a piece exploring the seven trends behind the continent’s digital future. You may have heard of Silicon Valley, but what about its Africa counterpart, Silicon Savannah? And that’s just one of many, Bright notes.

“Across the region a Silicon Valley inspired network is developing. The research I’ve done with Aubrey Hruby highlights the existence of roughly 200 African innovation hubs, 3,500 new tech related ventures, and $1 billion in venture capital to a pan-African movement of start-up entrepreneurs.”
Venture capitalist funding to African tech start-ups
But while the theme of technology dominates any discussion on the digital revolution and the way it could transform Africa, we must not lose sight of its cultural aspects. As Funmi Iyanda writes, “Africa doesn’t just need a digital revolution – it needs a cultural one, too”.
Interestingly, this same digital revolution could spark a cultural renaissance: “A social pan-Africanism existed even before the digital revolution through cross-border trade, but it was often hampered by unimaginative and rigid archaic laws,” she writes. Today, Iyanda argues, digital technologies are helping young Africans forge a sense of cultural cohesion that could lead to wider continental integration.
A people’s revolution
While exponential technologies might be the driving force behind the digital revolution, it is Africa’s most important resource – its people – who can determine the direction it will take.
With one of the fastest growing youth populations in the world, the next generation of Africans will lead the way, says Mokena Makeka.
 By 2050, these African countries will have the youngest populations in the world
But first, they must be given the space and opportunities to do so: “Africa’s biggest challenge over the next five years will be how it reconciles the demands of its strident youth – and their take on how to shape the post-colonial continent – in the face of established and entrenched power structures,” he argues.
How, though, do we create these opportunities? Fred Swaniker, who founded the African Leadership Network, has an idea: “Good leaders do not fall from the sky. The experience of successful nations points to the centrality of strong education institutions, and particularly robust higher education systems, in deliberately training the leaders who take societies to great heights.”
Which is why African policy-makers should be worried – the system is “at breaking point,” Swaniker writes. “The current state of higher education across the continent is a real threat to the dream of an African Century,” with low enrollment rates and stretched teaching staff.
 Gross enrollment ratio in tertiary education
His bold ambition is to rethink the way Africa’s next generation of leaders are trained: “At the African Leadership University, we have designed a university system that is built not around a scarce African resource – professors with PhDs – but around a resource we have in abundance – brilliant young students.”
Brilliant young minds is one thing Africa is not short of. Take the example of Ory Okolloh and Juliana Rotich, two Kenyan digital activists behind Ushahidi, a crisis-mapping tool. If Africa is to make the most of the opportunities offered by this digital revolution, it needs more bold, female innovators like them, argues Bineta Diop.
As the African Union’s Special Envoy for Women, Peace and Security, and the founder of her own NGO, she has a powerful message for other women on the continent: “I would like to invite young girls and women in Africa to embrace the fields of science, technology, engineering and mathematics, to help solve the problems facing our communities. Doing so would allow our continent to shift from an exporter of raw materials into a powerhouse of manufacturing, industry and job creation.”
Africa at a crossroads
The wider message from all the contributors to the series is this: it is Africans themselves who have the power to shape their continent’s transformation.
Take trade. Africa’s largest untapped market and its biggest opportunity for progress is right on its doorstep: “In 2014 in Europe, 69% of exports were to other countries on the continent. In Asia, that figure stood at 52% and in North America at 50%. Africa had the lowest level of intra-regional trade, at just 18%,” writes Jacqueline Musiitwa. She shares three things African decision-makers must do now to unlock that potential, including building the right infrastructure and connecting more people on the continent to the internet.
 Share of population without electricity in Africa
Image: International Energy Agency
Two leading African entrepreneurs are in agreement. For Ashish j. Thakkar and James I. Mwangi – both of whom sit on the United Nations Foundation’s Global Entrepreneurship Council – small and medium business owners on the continent could create the jobs and economic growth Africa needs to thrive.
“The only way we’ll create hundreds of thousands of jobs is by placing big bets on small businesses. SMEs represent 78% of jobs in low-income countries and more than 90% of all new jobs created each year. These businesses are the true global engines of employment. Increasing rates of entrepreneurship and accelerating the rate at which ventures grow is the only realistic path to creating enough jobs for the next generation.”
This is just a glimpse into all the issues we’ll discuss in Kigali. I invite you to join in the conversation by following the livestream sessions and sharing your thoughts on Africa’s future using #AF16

A brief overview of Africa’s tech industry – and 7 predictions for its future

Mwaura Kirore, a creative director at Planet Rackus, works on MA3Racer, a 2D mobile game inside his studio in Kenya's capital Nairobi, July 15, 2014.
As Africa transitions from the margins to the mainstream of the global economy, technology is playing an increasingly significant role. Bolstering regional trends in business, investment and modernization is the emergence of an IT ecosystem – a growing patchwork of entrepreneurs, tech ventures and innovation centres coalescing from country to country. Nigeria is a hotbed for start-up activity. Facebook, Netflix and SAP have recently expanded in Africa. And Silicon Valley investment is funnelling into ventures from South Africa to Kenya.

The rise of Silicon Savannah
Most discussions of the origins of Africa’s tech movement circle back to Kenya, which laid down four markers between 2007 and 2010 to inspire the country’s Silicon Savannah moniker: mobile money, a globally recognized crowdsourcing app, Africa’s tech incubator model, and a genuine government commitment to ICT policy.

In 2007, Kenyan telecom Safaricom launched the M-Pesa mobile money product. It grew rapidly to become perhaps Africa’s most recognized example of technological leapfrogging: launching ordinary citizens with mobile phones right over bricks-and-mortar banking into the digital economy. Shortly after M-Pesa’s introduction, four technologists created the Ushahidi crowdsourcing app, a highly effective tool for digitally mapping demographic events anywhere in the world. Ushahidi has since become an international tech company with multiple applications in over 20 countries.

In 2008, Ushahidi co-founder Erik Hersman hatched Nairobi’s iHub innovation centre after identifying the need to create a “nexus point for technologists, investors and tech companies”. Since 2010, iHub has produced 152 companies and grown a membership base of nearly 20,000 techies. iHub influenced Africa’s incubator movement, inspiring the upsurge in tech hubs across the continent.

Another Kenyan milestone was the government’s 2010 completion of The East African Marine System (TEAMS) undersea fibre optic cable project. TEAMS increased East African broadband and led to the establishment of Kenya’s Information and Communication Technology (ICT) Authority.

Africa’s emerging tech landscape
Notable as it has become, Silicon Savannah is but one corner of Sub-Saharan Africa’s tech scene. Across the region a Silicon Valley inspired network is developing. The research I’ve done with Aubrey Hruby highlights the existence of roughly 200 African innovation hubs, 3,500 new tech-related ventures, and $1 billion in venture capital (VC) to a pan-African movement of start-up entrepreneurs.
Venture capital funding to African tech start-ups
Increasingly, Nigeria is becoming a centre for big tech investment and commercially oriented start-ups. Whatever the country’s challenges, investors and entrepreneurs are attracted by the prospect of scaling applications to Africa’s largest population and economy. Many have set up shop in Lagos’s Yaba district. There you can find the headquarters for e-commerce start-up Africa Internet Group and digital payments venture Paga, located near incubators Andela and Co-Creation Hub.

Nigeria’s tech sector is becoming representative of repatriate entrepreneurs reversing some of Africa’s brain drain and IT reshaping the continent’s global linkages. All three of Africa’s most recognized e-commerce startups – Jumia, Konga and MallforAfrica – were founded by Nigerians who earned their university degrees and initial private sector experience in the US. A noteworthy portion of the roughly $600 million in VC to these entities comes from American and European investment firms. And the management of Jumia’s parent, Africa Internet Group, is a mix of repatriate Africans and MBA types from the US and Europe attracted to the continent’s IT opportunities over development work.

From Nigeria to Kenya, and Rwanda to Ghana, tech innovation is starting to influence multiple sectors: energy, agriculture, banking, healthcare, entertainment, transport and fashion.
Having researched the topic for the past six years, I believe technology in Africa has the potential to create more impact faster than anywhere previously in the world. There’ll be a lot to unpack on that prediction. To start, here are some trends to watch in the continent’s wired future.

Seven things to expect in African tech’s future
1. Start-ups leap into Africa’s informal economy
The African Development Bank estimates that 55% of sub-Saharan Africa’s economic activity is informal. That’s a massive commercial space without such services as business enterprise software, small business banking, affordable third-party logistics or internet access. Expect VC-backed start-ups to attempt scalable applications for nearly every corner of Africa’s informal economy.
Much of this is already occurring in Nigeria. First-time dotcoms are sprouting up for everything from e-commerce logistics, online auto sales and real-estate listings, to airline bookings, employment sites and credit rating services. The opportunities are infinite, especially as Africa’s broadband and smartphone penetration rates continue to improve.

2. State-to-state ICT competition
Following the lead of countries such as South Africa, Botswana and Kenya, there are growing expectations on African governments to flesh out ICT plans and infrastructure. Countries such as Ethiopia, Nigeria and Ghana are already feeling the pressure, conscious of the success of Silicon Savannah and recent gains by the government of Rwanda.

3. Tech disrupting development
IT will continue to be employed to solve long-standing African socio-economic issues. Aid-agency grants previously going to NGOs are already being diverted to social-venture focused African tech organizations. IBM’s Lucy Project is directed at solving “Africa’s grand challenges” – many of which have been relegated to the development sector. Cracking the continent’s long-standing problems will increasingly become a commercial tech opportunity.

4. African tech solutions with global application
M-Pesa has become a case study for global digital payments. Ushahidi was used in the 2012 US presidential election. Africa’s solar powered BRCK wifi device is bringing connectivity to internet deadspots in Wisconsin. Uber is experimenting with new service models in Africa that company executives tell me could later apply to operations globally. Commercial drone delivery is likely to take off first in Africa. Most of SSA’s tech applications are developing as solutions to local challenges, but this is creating unforeseen opportunities for other markets.

5. IT impacting Africa’s politics
Ushahidi played a role in Kenya’s last two elections. Digital media investigative site Sahara Reporters’ corruption reporting has led to the dismissal of senior Nigerian government officials. Social media applications Twitter and Facebook were heavily utilized by civil society organizations, opposition groups and political parties in Nigeria’s last presidential election. And African technology actors are closer to creating industry lobbying groups. As Sub-Saharan Africa and its citizens become even more connected to the digital grid, expect IT to influence how politics and elections are done.

6. Failure
I throw this in for balance. Among sub-Saharan Africa’s start-ups in particular, there will be many failures. Most of these ventures are operating in ICT environments lacking much of the baseline infrastructure for tech – namely affordable broadband and regular electricity. But as I’ve often pointed out to sceptics of African IT, failure is not necessarily a bad thing. It shows investors and entrepreneurs are committed and trying. Some 90% of US start-ups fail. But that means 10% succeed. A similar principle will apply in Africa. The momentum leading many African start-ups to fail will inevitably lead to the handful of monumental technological successes.

7. Sub-Sahara Africa’s first start-up unicorns and IPOs
Following trend 6, it’s only a matter of time before some of the region’s commercially oriented start-ups create Africa’s first big headlines, i.e. IPOs, acquisitions and unicorns. We already had a preview of this with Africa Internet Group’s recent Goldman Sachs-backed billion dollar valuation, followed by reports that fintech company Interswitch may soon go public on a major exchange – likely the London Stock Exchange.

History of science and technology in Africa

Early humans

The Great Rift Valley of Africa provides critical evidence for the evolution of early hominins. The earliest tools in the world can be found there as well:
  • An unidentified hominin, possibly Australopithecus afarensis or Kenyanthropus platyops, created stone tools dating to 3.3 million years ago at Lomekwi in the Turkana Basin, eastern Africa.
  • Homo habilis, residing in eastern Africa, developed another early toolmaking industry, the Oldowan, around 2.3 million years ago.
  • Homo erectus developed the Acheulean stone tool industry, specifically hand-axes, at 1.5 million years ago. This tool industry spread to the Middle East and Europe around 800,000 to 600,000 years ago. Homo erectus also begins using fire.[1]
  • Homo sapiens, or modern humans, created bone tools and backed blades around 90,000 to 60,000 years ago, in southern and eastern Africa. The use of bone tools and backed blades eventually became characteristic of Later Stone Age tool industries.[2] The first appearance of abstract art is during the Middle Stone Age, however. The oldest abstract art in the world is a shell necklace dated to 82,000 years ago from the Cave of Pigeons in Taforalt, eastern Morocco.[3] The second oldest abstract art and the oldest rock art is found at Blombos Cave in South Africa, dated to 77,000 years ago.[4]

Education

Social sciences in Africa, including education, have a long history.

Nile Valley

In 295 BC, the Library of Alexandria was founded in Egypt. It was considered the largest library in the classical world.
Al-Azhar University, founded in 970~972 as a madrasa, is the chief centre of Arabic literature and Sunni Islamic learning in the world. The oldest degree-granting university in Egypt after the Cairo University, its establishment date may be considered 1961 when non-religious subjects were added to its curriculum.

The Sahel

Three philosophical schools in Mali existed during the country's "golden age" from the 12th to the 16th centuries: University of Sankore, Sidi Yahya University, and Djinguereber University.
By the end of Mansa Musa's reign in Mali, the Sankoré University had been converted into a fully staffed University with the largest collections of books in Africa since the Library of Alexandria. The Sankoré University was capable of housing 25,000 students and had one of the largest libraries in the world with roughly 1000,000 manuscripts.[5][6]
Timbuktu was a major center of book copying, religious groups,[7][8] the sciences, and arts.[9][10] Scholars and students came throughout world to study in its university. It attracted more foreign students than New York University.[9][11]

Astronomy

Circular cromlech at Nabta
Three types of calendars can be found in Africa: lunar, solar, and stellar. Most African calendars are a combination of the three.[12] African calendars include the Akan calendar, Egyptian calendar, Berber calendar, Ethiopian calendar, Igbo calendar, Yoruba calendar, Shona calendar, Swahili calendar, Xhosa calendar, Borana calendar, and Luba calendar.

Western desert of Egypt

A stone circle located in the Nabta Playa basin may be one of the world's oldest known archeoastronomical devices. Built by the ancient Nubians about 4800 BCE, the device may have approximately marked the summer solstice.

Nile Valley

Since the first modern measurements of the precise cardinal orientations of the Egyptian pyramids were taken by Flinders Petrie, various astronomical methods have been proposed as to how these orientations were originally established.[13][14] Ancient Egyptians may have observed, for example, the positions of two stars in the Plough / Big Dipper which was known to Egyptians as the thigh. It is thought that a vertical alignment between these two stars checked with a plumb bob was used to ascertain where North lay. The deviations from true North using this model reflect the accepted dates of construction of the pyramids.[15]
Egyptians were the first to develop a 365-day, 12 month calendar. It was a stellar calendar, created by observing the stars.
During the 12th century, the astrolabic quadrant was invented in Egypt.[16]

The Sahel

Based on the translation of 14 Timbuktu manuscripts, the following points can be made about Timbuktu astronomical science during the 12th-16th centuries:
  1. They made use of the Julian Calendar.
  2. Generally speaking, they had a heliocentric view of the solar system.
  3. Diagrams of planets and orbits made use of complex mathematical calculations.
  4. Scientists developed an algorithm that accurately oriented Timbuktu to Mecca.
  5. They recorded astronomical events, including a meteor shower in August 1583.[17]
At this time, Mali also had a number of astronomers including the emperor and scientist Askia Mohammad I.[18]

Turkana Basin

Megalithic "pillar sites," known as "namoratunga," date to as early as 5,000 years ago and can be found surrounding Lake Turkana in Kenya.[19] Although somewhat controversial today, initial interpretations suggested that they were used by Cushitic speaking people as an alignment with star systems tuned to a lunar calendar of 354 days.[20]

South Africa

Today, South Africa has cultivated a burgeoning astronomy community. It hosts the Southern African Large Telescope, the largest optical telescope in the southern hemisphere. South Africa is currently building the Karoo Array Telescope as a pathfinder for the $20 billion Square Kilometer Array project. South Africa is a finalist, with Australia, to be the host of the SKA.

Mathematics

Central and Southern Africa

The Lebombo bone from the mountains between Swaziland and South Africa may be the oldest known mathematical artifact.[citation needed] It dates from 35,000 BCE and consists of 29 distinct notches that were deliberately cut into a baboon's fibula.[21][22]
The Ishango bone is a bone tool from the Democratic Republic of Congo dated to the Upper Paleolithic era, about 18,000 to 20,000 BCE. It is also a baboon's fibula,[23] with a sharp piece of quartz affixed to one end, perhaps for engraving or writing. It was first thought to be a tally stick, as it has a series of tally marks carved in three columns running the length of the tool, but some scientists have suggested that the groupings of notches indicate a mathematical understanding that goes beyond counting. Various functions for the bone have been proposed: it may have been a tool for multiplication, division, and simple mathematical calculation, a six-month lunar calendar,[24] or it may have been made by a woman keeping track of her menstrual cycle.[25]

Nile Valley

By the predynastic Naqada period in Egypt, people had fully developed a numeral system.[26] The importance of mathematics to an educated Egyptian is suggested by a New Kingdom fictional letter in which the writer proposes a scholarly competition between himself and another scribe regarding everyday calculation tasks such as accounting of land, labor and grain.[27] Texts such as the Rhind Mathematical Papyrus and the Moscow Mathematical Papyrus show that the ancient Egyptians could perform the four basic mathematical operations—addition, subtraction, multiplication, and division—use fractions, compute the volumes of boxes and pyramids, and calculate the surface areas of rectangles, triangles, circles and even spheres.[citation needed] They understood basic concepts of algebra and geometry, and could solve simple sets of simultaneous equations.[28]
D22
12
in hieroglyphs
Mathematical notation was decimal, and based on hieroglyphic signs for each power of ten up to one million. Each of these could be written as many times as necessary to add up to the desired number; so to write the number eighty or eight hundred, the symbol for ten or one hundred was written eight times respectively.[29] Because their methods of calculation could not handle most fractions with a numerator greater than one, ancient Egyptian fractions had to be written as the sum of several fractions. For example, the fraction two-fifths was resolved into the sum of one-third + one-fifteenth; this was facilitated by standard tables of values.[30] Some common fractions, however, were written with a special glyph; the equivalent of the modern two-thirds is shown on the right.[31]
Ancient Egyptian mathematicians had a grasp of the principles underlying the Pythagorean theorem, knowing, for example, that a triangle had a right angle opposite the hypotenuse when its sides were in a 3–4–5 ratio.[32] They were able to estimate the area of a circle by subtracting one-ninth from its diameter and squaring the result:
Area ≈ [(89)D]2 = (25681)r2 ≈ 3.16r2,
a reasonable approximation of the formula πr2.[32][33]
The golden ratio seems to be reflected in many Egyptian constructions, including the pyramids, but its use may have been an unintended consequence of the ancient Egyptian practice of combining the use of knotted ropes with an intuitive sense of proportion and harmony.[34]
Based on engraved plans of Meroitic King Amanikhabali's pyramids, Nubians had a sophisticated understanding of mathematics and an appreciation of the harmonic ratio. The engraved plans is indicative of much to be revealed about Nubian mathematics.[35]

The Sahel

All of the mathematical learning of the Islamic world during the medieval period was available and advanced by Timbuktu scholars: arithmetic, algebra, geometry, and trigonometry.

Other African traditions

One of the major achievements found in Africa was the advance knowledge of fractal geometry and mathematics. The knowledge of fractal geometry can be found in a wide aspect of African life from art, social design structures, architecture, to games, trade, and divination systems.[36] With the discovery of fractal mathematics in widespread use in Africa, Ron Eglash had this to say,
"We used to think of mathematics as a kind of ladder that you climb, and we would think of counting systems – one plus one equals two – as the first step and simple shapes as the second step. Recent mathematical developments like fractal geometry represented the top of the ladder in most Western thinking. But it's much more useful to think about the development of mathematics as a kind of branching structure and that what blossomed very late on European branches might have bloomed much earlier on the limbs of others. When Europeans first came to Africa, they considered the architecture very disorganized and thus primitive. It never occurred to them that the Africans might have been using a form of mathematics that they hadn't even discovered yet."[37]
The binary numeral system was also widely known through Africa before it was known throughout much of the world. It has been theorized that it could have influenced Western geomancy, which would lead to the development of the digital computer. [38]

Metallurgy

Most of sub-Saharan Africa moved from the Stone Age to the Iron Age. The Iron Age and Bronze Age occurred simultaneously. North Africa and the Nile Valley imported its iron technology from the Near East and followed the Near Eastern pattern of development from the Bronze Age to the Iron Age.
Ife bronze casting of a king's head currently in the British Museum
Many Africanists accept an independent development of the use of iron in Sub-Saharan Africa. Among archaeologists, it is a debatable issue. The earliest dating of iron in sub-Saharan Africa is 2500 BCE at Egaro, west of Termit, making it contemporary with iron smelting in the Middle East.[39] The Egaro date is debatable with archaeologists, due to the method used to attain it.[40] The Termit date of 1500 BCE is widely accepted. Iron use, in smelting and forging for tools, appears in West Africa by 1200 BCE, making it one of the first places for the birth of the Iron Age.[41][42][43] Before the 19th century, African methods of extracting iron were employed in Brazil, until more advanced European methods were instituted.[44]

West Africa

Besides being masters in iron, Africans were masters in brass and bronze. Ife produced lifelike statues in brass, an artistic tradition beginning in the 13th century. Benin mastered bronze during the 16th century, produced portraiture and reliefs in the metal using the lost wax process.[45] Benin also was a manufacturer of glass and glass beads.[46]

The Sahara

In the Aïr Mountains region of Niger, copper smelting was independently developed between 3000 and 2500 BCE. The undeveloped nature of the process indicates that it was not of foreign origin. Smelting in the region became mature around 1500 BCE.[47]

The Sahel

Africa was a major supplier of gold in world trade during the Medieval Age. The Sahelian empires became powerful by controlling the Trans-Saharan trade routes. They provided 2/3 of the gold in Europe and North Africa.[48] The Almoravid dinar and the Fatimid dinar were printed on gold from the Sahelian empires. The ducat of Genoa and Venice and the florine of Florence were also printed on gold from the Sahelian empires.[49] When gold sources were depleted in the Sahel, the empires turned to trade with the Ashante Kingdom.
The Swahili traders in East Africa were major suppliers of gold to Asia in the Red Sea and Indian Ocean trade routes.[50] The trading port cities and city-states of the Swahili East African coast were among the first African cities to come into contact with European explorers and sailors during the European Age of Discovery. Many were documented and praised in the recordings of North African explorer Abu Muhammad ibn Battuta.

Nile Valley

Nubia was a major source of gold in the ancient world. Gold was a major source of Kushitic wealth and power. Gold was mined East of the Nile in Wadi Allaqi and Wadi Cabgaba.[51]
Around 500 BCE, Nubia, during the Meroitic phase, became a major manufacturer and exporter of iron. This was after being expelled from Egypt by Assyrians, who used iron weapons.[52]

Aksum

The Aksumites produced coins around 270 CE, under the rule of King Endubis. Aksumite coins were issued in gold, silver, and bronze.

East Africa

Anthropologist Peter Schmidt discovered through the communication of oral tradition that the Haya in Tanzania have been forging steel for nearly 2000 years. This discovery was made accidentally while Schmidt was learning about the history of the Haya via their oral tradition. He was led to a tree which was said to rest on the spot of an ancestral furnace used to forge steel. When later tasked with the challenge of recreating the forges, a group of elders who at this time were the only ones to remember the practice, due to the disuse of the practice due in part to the abundance of steel flowing into the country from foreign sources. In spite of their lack of practice, the elders were able to create a furnace using mud and grass which when burnt provided the carbon needed to transform the iron into steel. Later investigation of the area yielded 13 other furnaces similar in design to the recreation set up by the elders. These furnaces were carbon dated and were found to be as old as 2000 years, whereas steel of this caliber did not appear in Europe until several centuries later.[53][54]
Two types of iron furnaces were used in Sub-Saharan Africa: the trench dug below ground and circular clay structures built above ground. Iron ores were crushed and placed in furnaces layered with the right proportion of hardwood. A flux such as lime sometimes from seashells was added to aid in smelting. Bellows on the side would be used to add oxygen. Clay pipes on the sides called tuyères would be used to control oxygen flow.[55]

Medicine

West Africa

The knowledge of inoculating oneself against smallpox seems to have been known to West Africans, more specifically the Akan. A slave named Onesimus explained the inoculation procedure to Cotton Mather during the 18th century; he reported to have gotten the knowledge from Africa.[56]

The Sahel

In Djenné the mosquito was identified to be the cause of malaria, and the removal of cataracts was a common surgical procedure.[57]
The dangers of tobacco smoking were known to African Muslim scholars, based on Timbuktu manuscripts.[58]

Nile Valley

Ancient Egyptian physicians were renowned in the ancient Near East for their healing skills, and some, like Imhotep, remained famous long after their deaths.[59] Herodotus remarked that there was a high degree of specialization among Egyptian physicians, with some treating only the head or the stomach, while others were eye-doctors and dentists.[60] Training of physicians took place at the Per Ankh or "House of Life" institution, most notably those headquartered in Per-Bastet during the New Kingdom and at Abydos and Saïs in the Late period. Medical papyri show empirical knowledge of anatomy, injuries, and practical treatments.[61] Wounds were treated by bandaging with raw meat, white linen, sutures, nets, pads and swabs soaked with honey to prevent infection,[62] while opium was used to relieve pain. Garlic and onions were used regularly to promote good health and were thought to relieve asthma symptoms. Ancient Egyptian surgeons stitched wounds, set broken bones, and amputated diseased limbs, but they recognized that some injuries were so serious that they could only make the patient comfortable until he died.[59]
Around 800, the first psychiatric hospital and insane asylum in Egypt was built by Muslim physicians in Cairo.
Around 1100, the ventilator is invented in Egypt.[63]
In 1285, the largest hospital of the Middle Ages and pre-modern era was built in Cairo, Egypt, by Sultan Qalaun al-Mansur. Treatment was given for free to patients of all backgrounds, regardless of gender, ethnicity or income.[64]
Tetracycline was being used by Nubians, based on bone remains between 350 AD and 550 AD. The antibiotic was in wide commercial use only in the mid 20th century. The theory is earthen jars containing grain used for making beer contained the bacterium streptomycedes, which produced tetracycline. Although Nubians were not aware of tetracycline, they could have noticed people fared better by drinking beer. According to Charlie Bamforth, a professor of biochemistry and brewing science at the University of California, Davis, said "They must have consumed it because it was rather tastier than the grain from which it was derived. They would have noticed people fared better by consuming this product than they were just consuming the grain itself."[65]
Successful Caesarean section performed by indigenous healers in Kahura, Uganda, as observed by R. W. Felkin in 1879

East Africa

European travelers in the Great Lakes region of Africa (Uganda and Rwanda) during the 19th century observed Caesarean sections being performed on a regular basis. The expectant mother was normally anesthetized with banana wine, and herbal mixtures were used to encourage healing. From the well-developed nature of the procedures employed, European observers concluded that they had been employed for some time.[66]

South Africa

A South African, Max Theiler, developed a vaccine against yellow fever in 1937.[67] Allan McLeod Cormack developed the theoretical underpinnings of CT scanning and co-invented the CT-scanner.
The first human-to-human heart transplant was performed by South African cardiac surgeon Christiaan Barnard at Groote Schuur Hospital in December 1967. See also Hamilton Naki.
During the 1960s, South African Aaron Klug developed crystallographic electron microscopy techniques, in which a sequence of two-dimensional images of crystals taken from different angles are combined to produce three-dimensional images of the target.

Agriculture

Northern Africa and the Nile Valley

Ethiopians were first to discover coffee's edible properties
Donkey possibly domesticated in the Nile Valley or Horn of Africa
Archaeologists have long debated whether or not the independent domestication of cattle occurred in Africa as well as the Near East and Indus Valley. Possible remains of domesticated cattle were identified in the Western Desert of Egypt at the sites of Nabta Playa and Bir Kiseiba and were dated to c. 9500-8000 BP, but those identifications have been questioned.[68] Genetic evidence suggests that cattle were most likely introduced from Southwest Asia, and that there may have been some later breeding with wild aurochs in northern Africa.[69]
Genetic evidence also indicates that donkeys were domesticated from the African wild ass.[70] Archaeologists have found donkey burials in early Dynastic contexts dating to ~5000 BP at Abydos, Middle Egypt, and examination of the bones shows that they were used as beasts of burden.[71]
Cotton (Gossypium herbaceum Linnaeus) may have been domesticated 5000 BCE in eastern Sudan near the Middle Nile Basin region, where cotton cloth was being produced.[72]

Ethiopia

Ethiopians, particularly the Oromo people, were the first to have discovered and recognized the energizing effect of the coffee bean plant.[73]
Cotton possibly domesticated 5000 BCE in Sudan
Teff is believed to have originated in Ethiopia between 4000 and 1000 BCE. Genetic evidence points to E. pilosa as the most likely wild ancestor.[74] Noog (Guizotia abyssinica) and ensete (E. ventricosum) are two other plants domesticated in Ethiopia.

The Sahel

The earliest evidence for the domestication of plants for agricultural purposes in Africa occurred in the Sahel region c. 5000 BCE, when sorghum and African rice (Oryza glaberrima) began to be cultivated. Around this time, and in the same region, the small guineafowl was domesticated. Other African domesticated plants were oil palm, raffia palm, black-eyed peas, groundnuts, and kola nuts.
Sorghum domesticated in the Sahel
African methods of cultivating rice, introduced by enslaved Africans, may have been used in North Carolina. This may have been a factor in the prosperity of the North Carolina colony.[75]
Yams were domesticated 8000 BCE in West Africa. Between 7000 and 5000 BCE, pearl millet, gourds, watermelons, and beans also spread westward across the southern Sahara.
Between 6500 and 3500 BCE knowledge of domesticated sorghum, castor beans, and two species of gourd spread from Africa to Asia. Pearl millet, black-eyed peas, watermelon, and okra later spread to the rest of the world.[76]

East Africa

Engaruka is an Iron Age archaeological site in northern Tanzania known for the ruins of a complex irrigation system. Stone channels were used to dike, dam, and level surrounding river waters. Some of these channels were several kilometers long, channelling and feeding individual plots of land totaling approximately 5,000 acres (20 km2).[77][78] Seven stone-terraced villages along the mountainside also comprise the settlement.

Textiles

Nile Valley

Egyptians wore linen from the flax plant, and used looms as early as 4000 BCE.[79] Nubians mainly wore cotton, beaded leather, and linen.

Ethiopia

Shemma, shama, and kuta are all cotton-based cloths used for making Ethiopian clothing. Three types of looms are used in Africa: the double heddle loom for narrow strips of cloth, the single heddle loom for wider spans of cloth, and the ground or pit loom. The double heddle loom and single heddle loom might be of African origin. The ground or pit loom is used in the Horn of Africa, Madagascar, and North Africa and is of Middle Eastern origins.[80][81]

Northern Africa and the Sahel

Boubou worn by Kora musician
The Djellaba was made typically of wool and worn in the Maghreb.
The textile of choice in the sahel is cotton. It is widely used in making the boubou (for men) and kaftan (for women). Camel hair was also used to make cloth in the Sahel and North Africa.
Bogolan Mud Cloth
Bògòlanfini (mudcloth) is cotton textile dyed with fermented mud of tree sap and teas, hand made by the Bambara people of the Beledougou region of central Mali.
By the 12th century, so-called Moroccan leather, which actually came from the Hausa area of northern Nigeria, was supplied to Mediterranean markets and found their way to the fairs and markets of such places as Normandy and Britain.

West Africa

Kente used silk from the Anaphe moth and was produced by the Akan people (Ashante, Fante, Enzema) in the countries of Ghana and Côte d'Ivoire.

Central Africa

Raffia cloth was the innovation of the Kuba people, present day Democratic Republic of Congo. It used the fibers of the leaves on the raffia palm tree.

East Africa

Barkcloth was used by the Baganda in Uganda from the Mutuba tree (Ficus natalensis). Kanga are Swahili pieces of fabric that come in rectangular shapes, made of pure cotton, and put together to make clothing. It is as long as ones outstretch hand and wide to cover the length of ones neck. Kitenge are similar to kangas and kikoy, but are of a thicker cloth, and have an edging only on a long side. Kenya, Uganda, Tanzania, and Sudan are some of the African countries where kitenge are worn. In Malawi, Namibia and Zambia, kitenge are known as Chitenge. Lamba Mpanjaka was cloth made of multicolored silk, worn like a toga on the island of Madagascar.

Southern Africa

In southern Africa one finds numerous use of animal hide and skins for clothing. The Ndau in central Mozambique and the Shona mixed hide with barkcloth and cotton cloth. Cotton weaving was practiced by the Ndau and Shona. Cotton cloth was referred to as machira. The Venda, Swazi, Basotho, Zulu, Ndebele, and Xhosa also made extensive use of hides.[82] Hides came from cattle, sheep, goat, elephant, and from jangwa( part of the mongoose family). Leopard skins were coveted and was a symbol of kingship in Zulu society. Skins were tanned to form leather, dyed, and embedded with beads.

Maritime technology

In 1987 the third oldest canoe in the world and the oldest in Africa, the Dufuna canoe, was discovered in Nigeria by Fulani herdsmen near the Yobe river and the village of Dufuna. It dates to approximately 8000 years ago, and was made from African mahogany.

North Africa

Carthage's fleet included large numbers of quadriremes and quinqueremes, warships with four and five ranks of rowers. Its ships dominated the Mediterranean. The Romans however were masters at copying and adapting the technology of other peoples. According to Polybius, the Romans seized a shipwrecked Carthaginian warship, and used it as a blueprint for a massive naval build-up, adding their own refinement – the corvus – which allowed an enemy vessel to be "gripped" and boarded for hand-to-hand fighting. This negated initially superior Carthaginian seamanship and ships.[83]

The Sahel and West Africa

In the 14th century CE King Abubakari II, the brother of King Mansa Musa of the Mali Empire is thought to have had a great armada of ships sitting on the coast of West Africa.[84] This is corroborated by ibn Battuta himself who recalls several hundred Malian ships off the coast.[85] The ships would communicate with each other by drums. This has led to great speculation, that Malian sailors may have reached the coast of Pre-Columbian America under the rule of Abubakari II, nearly two hundred years before Christopher Columbus.[86]
Bagandan War Canoe
Numerous sources attest that the inland waterways of West Africa saw extensive use of war-canoes and vessels used for war transport where permitted by the environment. Most West African canoes were of single log construction, carved and dug-out from one massive tree trunk. The primary method of propulsion was by paddle and in shallow water, poles. Sails were also used to a lesser extent, particularly on trading vessels. The silk cotton tree provided many of the most table logs for massive canoe building, and launching was via wooden rollers to the water. Boat building specialists were to emerge among certain peoples, particularly in the Niger Delta.[87]
Some canoes were 80 feet (24 m) in length, carrying 100 men or more. Documents from 1506 for example, refer to war-canoes on the Sierra Leone river, carrying 120 men. Others refer to Guinea coast peoples using canoes of varying sizes – some 70 feet (21 m) in length, 7–8 ft broad, with sharp pointed ends, rowing benches on the side, and quarter decks or focastles build of reeds, and miscellaneous facilities such as cooking hearths, and storage spaces for crew sleeping mats.

Nile Valley

Early Egyptians knew how to assemble planks of wood into a ship hull as early as 3000 BC (5000 BCE). The oldest ships yet unearthed, a group of 14 discovered in Abydos, were constructed from wooden planks which were "sewn" together.[88] Woven straps were used to lash the planks together, and reeds or grass stuffed between the planks helped to seal the seams.[89] Because the ships are all buried together and near a mortuary complex belonging to Pharaoh Khasekhemwy, originally the boats were all thought to have belonged to him. One of the 14 ships dates to 3000 BC, however, and is now thought to perhaps have belonged to an earlier pharaoh, possibly Pharaoh Aha.[90]
Early Egyptians also knew how to assemble planks of wood with treenails to fasten them together, using pitch for caulking the seams. The "Khufu ship", a 43.6-meter vessel sealed into a pit in the Giza pyramid complex at the foot of the Great Pyramid of Giza in the Fourth Dynasty around 2500 BCE, is a full-size surviving example which may have fulfilled the symbolic function of a solar barque. Early Egyptians also knew how to fasten the planks of this ship together with mortise and tenon joints.[91]

Horn of Africa and the Swahili Coast

It is known that ancient Axum traded with India, and there is evidence that ships from Northeast Africa may have sailed back and forth between India/Sri Lanka and Nubia trading goods and even to Persia, Himyar and Rome.[92] Aksum was known by the Greeks for having seaports for ships from Greece and Yemen.[93] Elsewhere in Northeast Africa, the 1st century CE Greek travelogue Periplus of the Red Sea reports that Somalis, through their northern ports such as Zeila and Berbera, were trading frankincense and other items with the inhabitants of the Arabian Peninsula as well as with the then Roman-controlled Egypt.[94]
Construction and repair of dhows, near Mtoni, Zanzibar
Middle Age Swahili kingdoms are known to have had trade port islands and trade routes[95] with the Islamic world and Asia and were described by Greek historians are "metropolises".[96] Famous African trade ports such as Mombasa, Zanzibar, Mogadishu and Kilwa[97] were known to Chinese sailors such as Zheng He and medieval Islamic historians such as the Berber Islamic voyager Abu Abdullah ibn Battuta.[98] The dhow was the ship of trade used by the Swahili. They could be massive. It was a dhow that transported a giraffe to Chinese Emperor Yong Le's court, in 1414. Although the dhow is often associated with Arabs, it is of Indian roots.[citation needed]

Architecture

West Africa

The Walls of Benin City are collectively the world's largest man-made structure and were semi-destroyed by the British in 1897.[99] Fred Pearce wrote in New Scientist:
"They extend for some 16,000 kilometres in all, in a mosaic of more than 500 interconnected settlement boundaries. They cover 6500 square kilometres and were all dug by the Edo people. In all, they are four times longer than the Great Wall of China, and consumed a hundred times more material than the Great Pyramid of Cheops. They took an estimated 150 million hours of digging to construct, and are perhaps the largest single archaeological phenomenon on the planet."[100]
Sungbo's Eredo is the second largest pre-colonial monument in Africa, larger than the Great Pyramids or Great Zimbabwe. Built by the Yoruba people in honour of one of their titled personages, an aristocratic widow known as the Oloye Bilikisu Sungbo, it is made up of sprawling mud walls and the valleys that surrounded the town of Ijebu-Ode in Ogun state, Nigeria.

North Africa and the Sahel

Around 1000 AD, cob (tabya) first appears in the Maghreb and al-Andalus.[101]
Tichit is the oldest surviving archaeological settlements in the Sahel and is the oldest all-stone settlement south of the Sahara. It is thought to have been built by Soninke people and is thought to be the precursor of the Ghana empire.[citation needed]
The Great Mosque of Djenné is the largest mud brick or adobe building in the world and is considered by many architects to be the greatest achievement of the Sudano-Sahelian architectural style, albeit with definite Islamic influences.

Nile Valley

The Egyptian step pyramid built at Saqqara is the oldest major stone building in the world.[102]
The Great Pyramid was the tallest man-made structure in the world for over 3,800 years.
The earliest style of Nubian architecture included the speos, structures carved out of solid rock, an A-Group (3700–3250 BCE) achievement. Egyptians made extensive use of the process at Speos Artemidos and Abu Simbel.[103]
Sudan, site of ancient Nubia, has more pyramids than anywhere in the world, even more than Egypt, a total of 223 pyramids exist.

Ethiopia

Aksumites built in stone. Monolithic stelae on top of the graves of kings like King Ezana's Stele. Later, during the Zagwe Dynasty Churches carved out of solid rocks like Church of Saint George at Lalibela.

Southern Africa

In southern Africa one finds ancient and widespread traditions of building in stone. Two broad categories of these traditions have been noted: 1. Zimbabwean style 2. Transvaal Free State style. North of the Zambezi one finds very few stone ruins.[104] Great Zimbabwe, Khami, and Thulamela[105] uses the Zimbabwean style. Tsotho/Tswana architecture represents the Transvaal Free State style. ||Khauxa!nas[106] stone settlement in Namibia represents both traditions. The Kingdom of Mapungubwe (1075–1220) was a pre-colonial Southern African state located at the confluence of the Shashe and Limpopo rivers which marked the center of a pre-Shona kingdom which preceded the culmination of southeast African urban civilization in Great Zimbabwe.

Communication systems

Griots are repositories of African history, especially in African societies with no written language. Griots can recite genealogies going back centuries. They recite epics that reveal historical occurrences and events. Griots can go for hours and even days reciting the histories and genealogies of societies. They have been described as living history books.

Nile Valley

Hieroglyphs on an Egyptian funerary stela
Africa's first writing system and the beginning of the alphabet was Egyptian hieroglyphs. Two scripts have been the direct offspring of Egyptian hieroglyphs, the Proto-Sinaitic script and the Meroitic alphabet. Out of Proto-Sinaitic came the South Arabian alphabet and Phoenician alphabet, out of which the Aramaic alphabet, Greek alphabet, the Brāhmī script, Arabic alphabet were directly or indirectly derived.
Out of the South Arabian alphabet came the Ge'ez alphabet which is used to write Blin(cushitic), Amharic, Tigre, and Tigrinya in Ethiopia and Eritrea.
Out the Phoenician Alphabet came tifinagh, the berber alphabet mainly used by the Tuaregs.
The other direct offspring of Egyptian hieroglyphs was the Meroitic alphabet. It began in the Napatan phase of Nubian history, Kush (700–300 BCE). It came into full fruition in the 2nd century, under the successor Nubian kingdom of Meroë. The script can be read but not understood, with the discovery at el-Hassa, Sudan of ram statues bearing meroitic inscriptions might assist in its translation.

The Sahel

With the arrival of Islam, came the Arabic alphabet in the Sahel. Arabic writing is widespread in the Sahel. The Arabic script was also used to write native African languages. The script used in this capacity is often called Ajami. The languages that have been or are written in Ajami include Hausa, Mandinka, Fulani, Wolofal, Tamazight, Nubian, Yoruba, Songhai, and Kanuri.[107]

West Africa

N'Ko script developed by Solomana Kante in 1949 as a writing system for the Mande languages of West Africa. It is used in Guinea, Côte d'Ivoire, Mali, and neighboring countries by a number of speakers of Manding languages.
Nsibidi is ideographic set of symbols developed by the Ekpe people of Southeastern coastal Nigeria for communication. A complex implementation of Nsibidi is only known to initiates of Ekpe secret society.
Nsibidi symbols
Adinkra is a set of symbols developed by the Akan (Ghana and Cote d'Ivoire), used to represent concepts and aphorisms.
The Vai syllabary is a syllabic writing system devised for the Vai language by Mɔmɔlu Duwalu Bukɛlɛ in Liberia during the 1830s.
Adamorobe Sign Language is an indigenous sign language developed in the Adamorobe Akan village in Eastern Ghana. The village has a high incident of genetic deafness.
A talking drum
Niger-Congo languages are tonal in nature. Talking drums exploit the tonal aspect of Niger-Congo languages to convey very complicated messages. Talking drums can send messages 15 to 25 miles (40 km). Bulu, a Bantu language, can be drummed as well as spoken. In a Bulu village, each individual had a unique drum signature. A message could be sent to an individual by drumming his drum signature.[108] It has been noted that a message can be sent 100 miles (160 km) from village to village within two hours or less using a talking drum.[109]

East Africa and Madagascar

On the Swahili coast, the Swahili language was written in Arabic script, as was the Malagasy language in Madagascar.

Warfare

Most of tropical Africa did not have a cavalry. Horses would be wiped out by tse-tse fly. The zebra was never domesticated. The army of tropical Africa consisted of mainly infantry. Weapons included bows and arrows[110] with low bow strength that compensated with poison tipped arrows. Throwing knives[111] were made use of in central Africa, spears that could double as thrusting cutting weapons, and swords were also in use. Heavy clubs when thrown could break bones, battle axe, and shields of various sizes were in widespread use. Later guns, muskets such as flintlock, wheelock, and matchlock. Contrary to popular perception, guns were also in widespread use in Africa. They typically were of poor quality, a policy of European nations to provide poor quality merchandise. One reason the slave trade was so successful was the widespread use of guns in Africa.
Fortification was a major part of defense, integral to warfare. Massive earthworks were built around cities and settlements in West Africa, typically defended by soldiers with bow and poison tipped arrows. The earthworks are some of the largest man made structures in Africa and the world such as the wall of Benin and Sungbo's Eredo. In Central Africa, the Angola region, one find preference for ditches, which were more successful for defense against wars with Europeans.
African infantry did not just include men. The state of Dahomey included all-female units, the so-called Dahomey Amazons, who were personal body guards of the king. The Queen Mother of Benin had her own personal army, 'Queens Own.'

Nile Valley

Ancient Egyptian weaponry include bows and arrow, maces, clubs, scimitars, swords, shields, and knives. Body armor was made of bands of leathers and sometimes laid with scales of copper. Horse-drawn chariots were used to deliver archers into the battle field. Weapons were initially made with stone, wood, and copper, later bronze, and later iron.
In 1260, the first portable hand cannons (midfa) loaded with explosive gunpowder, the first example of a handgun and portable firearm, were used by the Egyptians to repel the Mongols at the Battle of Ain Jalut. The cannons had an explosive gunpowder composition almost identical to the ideal compositions for modern explosive gunpowder. They were also the first to use dissolved talc for fire protection, and they wore fireproof clothing, to which Gunpowder cartridges were attached.[112]
Aksumite weapons were mainly made of iron: iron spears, iron swords, and iron knives called poniards. Shields were made of buffalo hide. In the latter part of the 19th century, Ethiopia made a concerted effort to modernize her army. She acquired repeating rifles, artillery, and machine guns. This modernization facilitated the Ethiopian victory over the Italians at the Tigray town of Adwa in the 1896 Battle of Adwa. Ethiopia was one of the few African countries to use artillery in colonial wars.
There are also a breastplate armor made of the horny back plates of crocodile from Egypt, which was given to the Pitt Rivers Museum as part of the archaeological Founding Collection in 1884.[113]

North Africa and the Sahel

The first use of cannons as siege machine at the siege of Sijilmasa in 1274, according to 14th-century historian Ibn Khaldun.
Mossi cavalry in the Sahel
The Sahelian military consisted of cavalry and infantry. Cavalry consisted of shielded, mounted soldiers. Body armor was chain mail or heavy quilted cotton. Helmets were made of leather, elephant, or hippo hide. Imported horses were shielded. Horse armor consisted of quilted cotton packed with kapok fiber and copper face plate. The stirrups could be used as weapon to disembowel enemy infantry or mounted soldiers at close range. Weapons included the sword, lance, battle-axe, and broad-bladed spear.[114] The infantry were armed with bow and iron tipped arrows. Iron tips were usually laced with poison, from the West African plant Strophantus hispidus. Quivers of 40–50 arrows would be carried into battle.[115] Later, muskets were introduced.

Southern Africa

At the Battle of Isandhlawana on 22 January 1879, the Zulu army defeated British invading troops.
From the 1960s to the 1980s, South Africa pursued research into weapons of mass destruction, including nuclear, biological, and chemical weapons. Six nuclear weapons were assembled. With the anticipated changeover to a majority-elected government in the 1990s, the South African government dismantled all of its nuclear weapons, the first nation in the world which voluntarily gave up nuclear arms it had developed itself.[116]

Commerce

Numerous metal objects and other items were used as currency in Africa.[117] They are as follows: cowrie shells, salt, gold (dust or solid), copper, ingots, iron chains, tips of iron spears, iron knives, cloth in various shapes (square, rolled, etc.).[118] Copper was as valuable as gold in Africa. Copper was not as widespread and more difficult to acquire, except in Central Africa, than gold. Other valuable metals included lead and tin. Salt was also as valuable as gold. Because of its scarcity, it was used as currency.

North Africa

Carthage imported gold, copper, ivory, and slaves from tropical Africa. Carthage exported salt, cloth, metal goods. Before camels were used in the trans-Saharan trade pack animals, oxen, donkeys, mules, and horses were utilized. Extensive use of camels began in the 1st century CE. Carthage minted gold, silver, bronze, and electrum(mix gold and silver) coins mainly for fighting wars with Greeks and Romans. Most of their fighting force were mercenaries, who had to be paid.[119]
Islamic North Africa made use of the Almoravid dinar and Fatimid dinar, gold coins. The Almoravid dinar and the Fatimid dinar were printed on gold from the Sahelian empires. The ducat of Genoa and Venice and the florine of Florence were also printed on gold from the Sahelian empires.[120]

West Africa and the Sahel

Cowry money
Cowries have been used as currency in West Africa since the 11th century when their use was first recorded near Old Ghana. Its use may have been much older. Sijilmasa in present-day Morocco seems to be a major source of cowries in the trans-Saharan trade.[121] In western Africa, shell money was usual tender up until the middle of the 19th century. Before the abolition of the slave trade there were large shipments of cowry shells to some of the English ports for reshipment to the slave coast. It was also common in West Central Africa as the currency of the Kingdom of Kongo called locally nzimbu. As the value of the cowry was much greater in West Africa than in the regions from which the supply was obtained, the trade was extremely lucrative. In some cases the gains are said to have been 500%. The use of the cowry currency gradually spread inland in Africa. By about 1850 Heinrich Barth found it fairly widespread in Kano, Kuka, Gando, and even Timbuktu. Barth relates that in Muniyoma, one of the ancient divisions of Bornu, the king's revenue was estimated at 30,000,000 shells, with every adult male being required to pay annually 1000 shells for himself, 1000 for every pack-ox, and 2000 for every slave in his possession. In the countries on the coast, the shells were fastened together in strings of 40 or 100 each, so that fifty or twenty strings represented a dollar; but in the interior they were laboriously counted one by one, or, if the trader were expert, five by five. The districts mentioned above received their supply of kurdi, as they were called, from the west coast; but the regions to the north of Unyamwezi, where they were in use under the name of simbi, were dependent on Muslim traders from Zanzibar. The shells were used in the remoter parts of Africa until the early 20th century, but gave way to modern currencies. The shell of the land snail, Achatina monetaria, cut into circles with an open center was also used as coin in Benguella, Portuguese West Africa.
The Ghana Empire, Mali Empire, and Songhay Empire were major exporters of gold, iron, tin, slaves, spears, javelin, arrows, bows, whips of hippo hide. They imported salt, horses, wheat, raisins, cowries, dates, copper, henna, olives, tanned hides, silk, cloth, brocade, Venetian pearls, mirrors, and tobacco.
Some of the currencies used in the Sahel included paper debt or IOU's for long distance trade, gold coins, and the mitkal (gold dust) currency. Gold dust that weighed 4.6 grams was equivalent to 500 or 3,000 cowries. Square cloth, four spans on each side, called chigguiya was used around the Senegal River.
In Kanem cloth was the major currency. A cloth currency called dandi was also in widespread use.[121]

Nile Valley

Ancient Egypt imported ivory, gold, incense, hardwood, and ostrich feather.[122]
Nubia exported gold, cotton/cotton cloth, ostrich feathers, leopard skins, ivory, ebony, and iron/iron weapons.[123]

Horn of Africa

Aksum exported ivory, glass crystal, brass, copper, myrrh, and frankincense. The Aksumites imported silver, gold, olive oil, and wine.[124] The Aksumites produced coins around 270 CE, under the rule of king Endubis. Aksumite coins were issued in gold, silver, and bronze.

East Africa

The Swahili served as middlemen. They connected African goods to Asian markets and Asian goods to African markets. Their most in demand export was Ivory. They exported ambergris, gold, leopard skins, slaves, and tortoise shell. They imported pottery and glassware from Asia. They also manufactured items such as cotton, glass and shell beads. Imports and locally manufactured goods were used as trade to acquire African goods. Trade links included the Arabian Peninsula, Persia, India, and China. The Swahili also minted silver and copper coins