Science and technology in Africa

China Suppliers


Early man

As man evolved in the Great Rift Valley and other regions of Africa, the first development of tools is found there as well:

Homo habilis, residing in East Africa, developed the first toolmaking industry, the Olduwan, around 2.3 million BCE. rustic western decor

Homo ergaster developed the Acheulean stone tool industry, specifically hand-axes, in Africa, 1.5 million BCE. This tool industry spread to the Middle East and Europe around 800,000 to 600,000 BCE. Homo erectus begins using fire. garden statue resin

Homo sapiens sapiens or modern man created bone tools and the back blade around 90,000 to 60,000 BCE, in Southern and East Africa. The use of bone tools and back blades became characteristic of later stone tool industries. The appearance of abstract art is during this period. The oldest abstract art in the world is a shell necklace dated 82,000 years in the Cave of Pigeons in Taforalt, eastern Morocco. The second oldest abstract art and the oldest rock art is found in the Blombos Cave at the cape in South Africa, dated 77,000 years. cherub figurines

Learning systems

Further information: List of oldest universities in continuous operation

Nile Valley

In 295 B.C., the Library of Alexandria was founded in Egypt. It was considered the largest library in the classical world.

Al-Azhar University, founded in Cairo, Egypt in the 10th century, offered a variety of academic degrees, including postgraduate degrees, and is often considered the first full-fledged university.

Sahelian

Three philosophical schools in Mali existed during her golden age (12th16th centuries) University of Sankore, Sidi Yahya University, and Djinguereber University.

By the end of Mansa Musa's reign, the Sankor University had been converted into a fully staffed University with the largest collections of books in Africa since the Library of Alexandria. The Sankor University was capable of housing 25,000 students and had one of the largest libraries in the world with between 400,000 to 700,000 manuscripts.

Timbuktu was a major center of book copying, with scholars visiting from throughout the Muslim world.

Other African traditions

In 859 A.D., the University of Al Karaouine in Fes, Morocco is founded by the princess Fatima al-Fihri. It is recognized by the Guinness Book of World Records as the oldest academic degree-granting university in the world.

Astronomy

Circular chromlech at Nabta

At Nabta Playa is the world's oldest known archeoastronomical devices, about 1000 years older than Stonehenge. It may have been a prehistoric calendar which accurately marks the summer solstice.

Three types of calendars can be found in Africa: 1. Lunar 2. Solar 3. Stellar

Nile Valley

Since the first modern measurements of the precise cardinal orientations of the pyramids by Flinders Petrie, various astronomical methods have been proposed for the original establishment of these orientations. It was recently proposed that this was done by observing 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.

Egyptians were the first to develop a 365 day, 12 month calendar. It was a stellar calendar,created by observing the stars.

Some have argued that the pyramids were laid out as a map of the three stars in the belt of Orion, although this theory has been criticized by reputable astronomers.

During the 1100s, the astrolabic quadrant is invented in Egypt.

Sahelian

Based on the translation of 14 Timbuktu manuscripts, the following points can be made about Timbuktu astronomical science: 1. They made use of the Julian Calendar 2. They had a Geo-centric view of the cosmos 3. Diagrams of planets and orbits made use of complex mathematical calculations 4. Developed algorithm that accurately orient Timbuktu to Mecca 5. They recorded astronomical events, including a meteor shower in August 1583.

Other African traditions

Namoratunga a group of megaliths, dated 300 B.C., was used by Cushitic speaking people as an alignment with star systems tuned to a lunar calendar of 354 days. This discovery was made by B.N. Lynch and L. H. Robins of Michigan State University.

Great Zimbabwe could have been an astronomical observatory contends Richard Wade, of the Nkwe Ridge Observatory, South Africa after 30 years of researching the site. In southern Zimbabwe the shadow of the Moon appears between 0610 and 0620 near the site. Megaliths east of the Great Enclosure align with the Moon, the Sun, and stars during important astronomical events of the year. One Megaliths could be an eclipse predictor. The conical structure aligns with a supernova in the Vela, 700800 years ago.

African Calendars:

Ashanti Calendar

Berber calendar

Ethiopian Calendar

Yoruba Calendar

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

The Lebombo bone is the oldest known mathematical artifact. It dates from 35,000 BC and consists of 29 distinct notches that were deliberately cut into a baboon's fibula.

This image shows both the front and back of the Ishango bone.

The Ishango bone is a bone tool, dated to the Upper Paleolithic era, about 18,000 to 20,000 BC. It is a dark brown length of bone, the fibula of a baboon, 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. These are the function postulated about the Ishango bones: 1. A tool for multiplication, division, and simple mathematical calculation 2. A six month lunar calendar 3. a construct of a woman, keeping track of her menstrual cycle

Nile Valley

The earliest attested examples of mathematical calculations date to the predynastic Naqada period, and show a fully developed numeral system. 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. Texts such as the Rhind Mathematical Papyrus and the Moscow Mathematical Papyrus show that the ancient Egyptians could perform the four basic mathematical operationsddition, subtraction, multiplication, and divisionse 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.

23

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. 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. Some common fractions, however, were written with a special glyph; the equivalent of the modern two-thirds is shown on the right.

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 345 ratio. 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 r2.

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.

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.

Sahelian

All mathematical learning of the islamic world during the medieval period were available to Timbuktu scholars arithmetic, algebra, geometry, and trigonometry. During this period islamic mathematical science was the most advance in the world.

Other African traditions

One of the major achievements found in Africa was the advance knowledge of fractal geometry. The knowledge of fractal geometry can be found in a wide aspect of African life from art, social design structures, architecture, to devination systems. 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."

Metallurgy

Further information: Iron Metallurgy in Africa

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 Near Eastern course of Bronze Age and Iron Age development.

Ife bronze casting of a king's head currently in the British Museum.

Many Africanist accept an independent development of the use of iron in Sub-Saharan Africa. Among archaeologist, it is a debatable issue. The earliest dating of iron in Sub-Saharan Africa is 2500 B.C. at Egaro, west of Termit, making it contemporary to the Middle East. The Egaro date is debatable with archaeologist, due to method used to attain it. The Termit date of 1500 B.C. is widely accepted. Iron use, in smelting and forging for tools, appears in West Africa by 1200 BC, making it one of the first places for the birth of the Iron Age. Before the 1800s, African methods of extracting iron was employed in Brazil, until more advanced European methods were instituted.

In the region of the Ar Mountains in Niger we have the development of independent copper smelting between 30002500 BCE. The process was not in a developed state, indication smelting was not foreign. It became mature about the 1500 BCE.

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.

Around 500 BCE, Nubia, in her Meroitic phase, became a major manufacturer and exporter of iron. This was after being expelled from Egypt by Assyrians, who used iron weapons.

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

Sahelian

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. 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. 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.

Other African traditions

Besides being masters in iron, Africans were masters in brass and bronze. Ife produced life-like 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. Benin also was a manufacturer of glass, glass beads.

Anthropologist Peter Schmidt discovered through the communication of oral tradition that the Haya 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 lead 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. this skill was all but forgotten. However, in spite of the 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 land 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.

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 propotion of hardwood. A flux such as lime sometimes from seashells were added to aid in smelting. Bellows on the side would be used to add oxygen. Clay pipes on the sides called tuyres would be used to control oxygen flow.

Medicine

Further information: Ancient Egyptian medicine

Nile Valley

Ancient Egyptian physicians were renowned in the ancient Near East for their healing skills, and some, like Maddie, remained famous long after their deaths. 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. 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 Sas in the Late period. Medical papyri show empirical knowledge of anatomy, injuries, and practical treatments. Wounds were treated by bandaging with raw meat, white linen, sutures, nets, pads and swabs soaked with honey to prevent infection, 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.

Around 800, the first psychiatric hospital and insane asylum in Egypt is built by Muslim physicians in Cairo.

Around 1100, the ventilator is invented in Egypt.

In 1285, the largest hospital of the Middle Ages and pre-modern era is 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.

Tetracycline was being used by Nubians, based on bone remains between 350 A.D. and 550 A.D. 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 bacteria streptomycedes, which produced tetracycline. Although Nubians were not aware of tetracycline, they could have notice 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."

Sahelian

In Jenne the mosquito was identified to be the cause of malaria, and the removal of cataracts was a common surgical procedure.

The dangers of tobacco smoking were known to African Muslim scholars, based on Timbuktu manuscripts.

Other African traditions

Successful Caesarean section performed by indigenous healers in Kahura, Uganda. As observed by R. W. Felkin in 1879.

The knowledge of inoculating oneself against smallpox seems to have been known to West Africans, more specifically the Akan. A slave name Onesimus explained the inoculation procedure to Cotton Mather during the 1700, he reported to have gotten the knowledge from Africa.

European travelers in the Great Lakes region of Africa(Uganda and Rwanda) during the 19th century observed Caeserean 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.

South African, Max Theiler developed a vaccine against Yellow Fever in 1937.

The first human-to-human heart transplant was performed by South African cardiac surgeon Christiaan Barnard at Groote Schuur Hospital in December 1967.

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.

South African, Allan McLeod Cormack develop the theoretical underpinnings of CT scanning and co-invented the CT-scanner.

Agriculture

Nile Valley

Ethiopians were first to discover its edible properties

Donkey domesticated in the Horn of Africa

Africa may have been the third region of independent cattle domestication and also the first. The first location of cattle domestication in Africa agreed upon is Capeletti, Algeria, about 6500 BP, but Bos cattle remains have been found in Nabta Playa and Bir Kiseiba as far back as 9000 BP, making it the first location of domestication. Scholars are divided as to independent and earliest domestication of cattle.

Between 13,000 and 11,0000 BCE wild grains began to be collected as source of food in the cataract region of the nile, south of Egypt. The collecting of wild grains as source of food spread to Syria, parts of Turkey and Iran by the eleventh millennium BCE. By the tenth and ninth millennia southwest Asians domesticated their wild grains, wheat and barley after the notion of collecting wild grains was spread from the nile.

The donkey was domesticated in the Red Sea Hill and the Horn of Africa in 4,000 BCE and spread to southwest Asia.

Ethiopians, particularly the Oromo people, were the first to have discovered and recognized the energizing effect of the coffee bean plant.

Cotton(Gossypium herbaceum Linnaeus) was domesticated 5000 BCE in eastern Sudan near the Middle Nile Basin region, and cotton cloth was being produced.

Cotton domesticated 5000 BCE in Sudan

Teff is believed to have originated in Ethiopia between 4000 BC and 1000 BC. Genetic evidence points to E. pilosa as the most likely wild ancestor.Noog(Guizotia abyssinica) and ensete(E. ventricosum) are two other plants domesticated in Ethiopia.

Sahelian

Agriculture was developed independently from the Middle East in the Sahel.

The first instances of domestication of plants for agricultural purposes in Africa occurred in the Sahel region circa 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 method of cultivating rice was used in North Carolina introduced by enslaved African. african rice cultivation was a factor in the prosperity of the North Carolina colony.

Yam was domesticated 8,000 B.C. in West Africa. Between 7000 and 5000 bc, pearl millet, gourds, watermelons, and beans, and farming and herding practices were spread westward across the southern Sahara.

West Africans were probably the first people to start using the method of fish lines and hook in fishing. The hooks were made of bone , hard wood, or shell between 16,000 to 9,000 BCE.

Between 6500 and 3500 BCE knowledge of domesticated sorghum, castor beans, and two species of gourd spread from Africa to Asia, later pearl millet, black eyed peas, watermellon and okra to the rest of the world.

Pottery was first made in the Sahel around 9000 to 8000 BCE, making it one of the earliest region of independent pottery development.

Other African tradition

Engaruka is a ruined settlement on the slopes of Mount Ngorongoro in northern Tanzania. Seven stone terraced villages along the mountainside comprised the settlement. A complex structure of stone channel irrigation was used to dike, dam, and level surrounding river waters. The stone channels run along the mountainside and base. Some of these channels were several kilometers long channelling and feeding individual plots of land. The irrigation channels fed a total area of 5000 acres.

Textile

Nile Valley

Egyptians wore linen from the flax plant, which were beaten and combed. The priest and pharaohs wore leopard skin. The ancient Egyptians used looms as early as 4000 BC.

Nubians mainly wore cotton, beaded leather, and linen. Nubia was also a center of cotton manufacturing. Cotton was domesticated 5000 BCE in eastern Sudan near the Middle Nile Basin region, and cotton cloth was being produced.

Shemma, shama, and kuta are all cotton base cloth used for making Ethiopian clothing.

Sahelian

Boubou worn by Kora musician

The textile of choice in the sahel is cotton. It is widely used in making the boubou (male) and kaftan (female), a style of West African clothing.

Bogolan Mud Cloth

Bglanfini(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 twelfth 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.

Other African traditions

Other African indigenous textile traditions included djellaba, kente cloth, raffia cloth, barkcloth, kanga, kitenge, and lamba mpanjaka. The Djellaba was made typically of wool and worn in the Maghreb. Kente used silk from the Anaphe moth and was produced by the Akan people (Ashante, Fante, Enzema) in the countries of Ghana and Ivory Coast. 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. Barkcloth was used by the Baganda in Uganda from the Mutuba tree (Ficus natalensis). Kanga are Swahili cloth that comes 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. Kitenges 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 is worn. In Malawi, Namibia and Zambia, kitenge is known as Chitenge. Lamba Mpanjaka was cloth made of multicolored silk, worn like a toga on the island of Madagascar.

Camel hair was also used to make cloth in the Sahel and North 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, 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. 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.

Three types of looms are used in Africa: 1. the double heddle loom for narrow strips of cloth, 2. the single heddle loom for wider spans of cloth 3. the ground or pit loom. The double heddle loom and single heddle loom might be of indigenous origin. The ground or pit loom is used in the Horn of Africa, Madagascar, and North Africa and is of Middle Eastern origins.

Maritime

In 1987 the third oldest canoe in the world and the oldest in Africa was discovered in Nigeria by fulani herdsmen, near the Yobe river, in the village of Dufuna. It was dated 8000 years, cut out of African mahogany. Based on "stylistic sophistication", the tradition of canoe building must have gone further back in time, noted one archaeologist.

Nile Valley

Egypt's earliest known boat goes back 5000 years. Early Egyptians knew how to assemble planks of wood into a ship hull as early as 3000 BC. The Archaeological Institute of America reports that the oldest ships yet unearthed, a group of 14 discovered in Abydos, were constructed of wooden planks which were "sewn" together. Discovered by Egyptologist David O'Connor of New York University. woven straps were found to have been used to lash the planks together, and reeds or grass stuffed between the planks helped to seal the seams. Because the ships are all buried together and near a mortuary belonging to Pharaoh Khasekhemwy, originally they were all thought to have belonged to him, but one of the 14 ships dates to 3000 BC, and the associated pottery jars buried with the vesse The ship dating to 3000 BC was 75 feet long and is now thought to perhaps have belonged to an earlier pharaoh. Professor O'Connor, the 5,000-year-old ship may have even belonged to Pharaoh Aha.

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 BC, 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.

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. Aksum was known by the Greeks for having seaports for ships from Greece and Yemen. Elsewhere in Northeast Africa, the 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 well before the arrival of Islam as well as with then Roman-controlled Egypt.

Sahelian

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. This is corroborated by ibn Battuta himself who recalls several hundred Malian ships off the coast. 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.

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 thesui most table logs for massive canoe building, and launching was via wooden rollers to the water. Boat building specialists were to emerge among certain tribes, particularly in the Niger Delta.

War Canoe

Some canoes were 80 feet 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 in length, 78 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.

Other African tradition

Carthage's fleet included large numbers of quadriremes and quinquiremes, 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 its own refinements- 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.

Construction and repair of dhows, near Mtoni, Zanzibar

Middle Age Swahili Kingdoms are known to have had trade port islands and trade routes with the Islamic world and Asia and were described by Greek historians are "metropolises". Famous African trade ports such as Mombasa, Zanzibar, Mogadishu and Kilwa were known to Chinese sailors such as Zheng He and medieval Islamic historians such as the Berber Islamic voyager Abu Abdullah ibn Battua. 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.

Architecture

Further information: Architecture of Africa

Nile Valley

The Egyptian step pyramid built at Saqqara is the oldest major stone building in the world.

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 (37003250 B.C.E.) achievement. Egyptians made extensive use of the process at Speos Artemidos and Abu Simbel.

Sudan, site of ancient Nubia, has more pyramids than anywhere in the world, even more than Egypt, a total of 223 pyramids exist.

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 St. George at Lalibela.

Sahelian

Tichitt Walata is the oldest surviving archaeological settlements in West Africa and the oldest all stone base 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.

Adobe, mudbrick, and earth were the medium of West African and Sahelian architecture. Some notable structures are as follows:

The Great Mosque of Djenn 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.

The Walls of Benin City is the world's largest man-made structure which was semi-destroyed by the British in 1897. 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.

Sungbo's Eredo is the second largest pre-colonial monument in Africa, larger than the Great Pyramids or Great Zimbabwe. Built by the Yoruba ethnique, it is made up of sprawling mud walls and the valleys that surrounded the town of Ijebu-Ode in Ogun state, Nigeria.

Other African traditions

One common theme in much traditional African architecture is the use of fractal scaling: small parts of the structure tend to look similar to larger parts, such as a circular village made of circular houses.

Around 1000 A.D., cob (tabya) first appears in the Maghreb and al-Andalus.

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 little stone ruins.Great Zimbabwe, Khami, Thulamela uses the Zimbabwean style. Tsotho/Tswana architecture represents the Transvaal Free State style. ||Khauxa!nas stone settlement in Namibia represents both traditions.

Communication systems

Further information: Writing systems of Africa

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 Brhm 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 (700300 BCE). It came into full fruition in the 2nd century, under the successor Nubian kingdom of Mero. 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.

Sahelian

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 called Ajami. The Ajami languages include Hausa, Mandinka, Fulani, Wolofal, Tamazight, Nubian, Yoruba, Songhai, and Kanuri. In East Africa Swahili and Somali were also written in Arabic script. So too was the Malagasy language in Madagascar.

N'Ko a script developed by Solomana Kante in 1949 as a writing system for the Mande languages of West Africa. It is used in Guinea, Cte d'Ivoire, and actively used by the Bambara in Mali.

Other African tradition

Nsibidi symbols

Nsibidi is ideographic set of symbols developed by the Ekpe people of Southeastern coastal Nigeria for communication. More complex implementation of Nsibidi are only known to initiates of Ekpe secret society.

Adinkra is a set of symbols developed by the Akan(Ghana and Cote d'Ivoire) , used to represent concepts and aphorisms.

Vai is syllabic script invented by Mmlu Duwalu Bukl in Liberia during the 1830s.

A talking drum

Niger-Congo Languages are tonal in nature. Talking drums exploits the tonal aspect of Niger-Congo languages to convey very complicated messages. Talking drums can send message 15 to 25 miles. 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. It has been noted that a message can be sent 100 miles from village to village within two hours or less using a talking drum.

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.

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.

Warfare

Further information: African military systems to 1800  and African military systems (18001900)

Nile Valley

Ancient Egyptian weaponry include bows and arrow, maces, clubs, swords, scimitars, battle axe, spears, shields, and scabbard. Body armor was made of bands of leathers and sometimes laid with scales and sleeves. Horse drawn chariots were used to deliver archers into the battle field. Weapons would be made initially 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.

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 1800s Ethiopia made a concerted effort to modernize her army. She acquired repeating rifles, artillery, and machine guns. This later facilitated her victory at the Battle of Adwa. Ethiopia was one of the few African countries to use artillery in colonial wars.

Battle of Adwa, Ethiopian army defeated Italians at the Tigray town of Adwa in 1896.

Sahelian

Mossi cavalry in the sahel

Sahelian military consisted of cavalry and infantry. Calvary consisted of shielded mounted soldiers. Body armor consisted of 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 disembow enemy infantry or mount at close range. Weapons included sword, lance, battle-axe, and broad-bladed spear. 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 4050 arrows would be carried into battle. Later musket would be introduced making the infantrymen more deadly an entity.

Other African traditions

The first use of cannons as siege machine at the siege of Sijilmasa in 1274, according to 14th-century historian Ibn Khaldun.

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 with low bow strength that compensated with poison tipped arrows. Throwing knives 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. Against popular perception guns were 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, who were personal body guards of the king. The Queen Mother of Benin had her own personal army,'Queens Own'.

Battle of Isandhlawana, Zulu army defeats British invading troops, in January 22, 1879.

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.

Commerce

Nile Valley

Ancient Egypt imported ivory, gold, incense, hardwood, and ostrich feather.

Nubia exported gold, cotton/cotton cloth, ostrich feathers, leopard skins, ivory, ebony, and iron/iron weapons.

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

Sahelian

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 are as follows: 1. Paper debt or IOU's were used for long distance trade. 2. Gold coins were also in use. 3. The mitkal(gold dust) currency was in use. It was gold dust that weighed 4.6 grams equivalent to 500 or 3,000 cowries. 4. 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 in widespread use.

Other African traditions

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, ox, 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.

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..

The Swahilis 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 ambergis, gold, leopard skins, slave, and tortoise shell. They imported from Asia oriental pottery and glassware. 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.

Numerous metal objects and other items were used as currency in Africa. 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. 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.

The use of cowries as currency in West Africa has been since the 11 century when it was first recorded near Old Ghana. Its use has been much older. Sijilmasa in present day Morocco seems to be a major source of cowries in the trans-saharan trade. 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 Muslem 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.

Miscellaneous

Nile Valley

Around 650 Calid, an Umayyad prince, translated the literature of Egyptian alchemy into the Arabic language.

In 953, the earliest historical record of a reservoir fountain pen dates back to 953, when Ma'ad al-Mu'izz, the caliph of Egypt, demanded a pen which would not stain his hands or clothes, and was provided with a pen which held ink in a reservoir and delivered it to the nib via gravity and capillary action, as recorded by Qadi al-Nu'man al-Tamimi (d. 974) in his Kitdb al-Majalis wa'l-musayardt.

Ahmed Zewail, in 1999 won the Nobel Prize in chemistry for his work in femtochemistry, methods that allow the description of change states in femtoseconds or very short seconds.

Sahelian

Other African traditions

African art was highly influential in the Modernist art movement. African art was very influential in the works of Pablo Picasso, Henri Matisse, and Jacques Lipchitz.

See also

Advocate for the Revolution of Science and Technology in Africa

Science in medieval Islam

Timeline of Islamic science and technology

References

^ a b Abraham, Curtis. "Stars of the Sahara". New Scientist, issue 2617,15 August 2007, page 3941

^ Gabara, Nthambeleni. Developed Nations Should Invest In African Universities. Buanews, 12 November 2009

^ Nordling, Linda. Africa Analysis: Progress on science spending?. ScidevNet, 29 October 2009.

^ South Africa Investment in Research and Development on the Rise. Department of Science and Technology: Science and Technology, 22 June 2006.

^ a b c d e Karen, MacGregor. AFRICA: Researchers lag in science and technology. University World issue 0018 23 November 2008

^ http://www.nepadst.org/doclibrary/pdfs/doc27_082005.pdf

^ Shillington, Kevin(2005). History of Africa, Rev. 2nd Ed. New York: Palgrave Macmillan, p. 4, ISBN 0-333-59957-8.

^ Ehret, Christopher (2002). The Civilizations of Africa. Charlottesville: University of Virginia, pp. 22, ISBN 0-8139-2085-x.

^ http://www.sciencedaily.com/releases/2007/06/070618091210.htm

^ http://news.bbc.co.uk/2/hi/science/nature/1753326.stm

^ See Said Hamdun & Nol King (edds.), Ibn Battuta in Black Africa. London 1975, pp. 5253.

^ The Guinness Book Of Records, Published 1998, P.242, ISBN 0-5535-7895-2.

^ Peek,Philip M., and Yankah, Kwesi(2004). African folklore: an encyclopedia. Taylor & Francis, ISBN 041593933X, 9780415939331

^ Belmonte, J. A. (2001). "On the Orientation of Old Kingdom Egyptian Pyramids". Archaeoastronomy: Supplement to the Journal for the History of Astronomy 32 (26): S120.

^ Neugebauer, Otto (1980). "On the Orientation of Pyramids". Centaurus 24: 13. doi:10.1111/j.1600-0498.1980.tb00362.x.

^ Spence, K (16 November 2000). "Ancient Egyptian Chronoology and the astronomical orientation of the pyramids". Nature 406: 320324. doi:10.1038/35042510.

^ Hancock, G (1996). Fingerprints of the Gods. New York: Three Rivers Press.

^ Fairall, A. (1999). "Precession and the layout of the Ancient Egyptian pyramids". Astronomy & Geophysics: the Journal of the Royal Astronomical Society 40 (4). http://www.antiquityofman.com/Orion_Fairall.html. Retrieved on 2008-03-22.

^ Krupp, E.C. (February 1997b). "Pyramid Marketing Schemes". Sky and Telescope.

^ Roberto Moreno, Koenraad Van Cleempoel, David King (2002). "A Recently Discovered Sixteenth-Century Spanish Astrolabe", Annals of Science 59 (4), p. 331362 .

^ Krup, Edwin C. (2003). Echoes of the Ancient Skies. Courier Dover Publications, pp. 170(1) ,ISBN 0486428826

^ Clark, Stuart and Carrington, Damian. Eclipse brings claim of medieval African observatory. 04 December 2002.

^ Ed Pegg, Jr., "Lebombo Bone" from MathWorld.

^ David J. Darling. The Universal Book of Mathematics: From Abracadabra to Zeno's Paradoxes. John Wiley and Sons, 2004 (ISBN 0471270474)

^ A very brief history of pure mathematics: The Ishango Bone University of Western Australia School of Mathematics accessed January 2007.

^ Marshack, Alexander (1991): The Roots of Civilization, Colonial Hill, Mount Kisco, NY.

^ Zaslavsky, Claudia: "Women as the First Mathematicians", International Study Group on Ethnomathematics Newsletter, Volume 7 Number 1, January 1992.

^ Understanding of Egyptian mathematics is incomplete due to paucity of available material and lack of exhaustive study of the texts that have been uncovered. Imhausen et al. (2007) p. 13

^ Imhausen, Annette; Eleanor Robson, Joseph W. Dauben, Kim Plofker, J. Lennart Berggren, Victor J. Katz (2007). The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook. Princeton: Princeton University Press, p. 11. ISBN 0-691-11485-4.

^ Clarke, Somers (1990). Ancient Egyptian Construction and Architecture. New York, New York: Dover Publications, Unabridged Dover reprint of Ancient Egyptian Masonry: The Building Craft originally published by Oxford University Press/Humphrey Milford, London, (1930), p. 222. ISBN 0-486-26485-8.

^ Clarke, Somers (1990). Ancient Egyptian Construction and Architecture. New York, New York: Dover Publications, Unabridged Dover reprint of Ancient Egyptian Masonry: The Building Craft originally published by Oxford University Press/Humphrey Milford, London, (1930), p. 217. ISBN 0-486-26485-8.

^ Clarke, Somers (1990). Ancient Egyptian Construction and Architecture. New York, New York: Dover Publications, Unabridged Dover reprint of Ancient Egyptian Masonry: The Building Craft originally published by Oxford University Press/Humphrey Milford, London, (1930), p. 218. ISBN 0-486-26485-8.

^ Gardiner, Sir Alan (1957). Egyptian Grammar: Being an Introduction to the Study of Hieroglyphs. Oxford, England: Griffith Institute, p. 197. ISBN 0-900416-35-1.

^ a b Strouhal (1989) p. 241

^ Imhausen, Annette; Eleanor Robson, Joseph W. Dauben, Kim Plofker, J. Lennart Berggren, Victor J. Katz (2007). The Mathematics of Egypt, Mesopotamia, China, India, and Islam: A Sourcebook. Princeton: Princeton University Press, p. 31. ISBN 0-691-11485-4.

^ Kemp, Barry (1991). Ancient Egypt: Anatomy of a Civilization. London, England: Routledge, p. 138. ISBN 0415063469.

^ Bianchi, Robert Steven(2004). Daily Life of the Nubians. Greenwood Press: PP. 230. ISBN 0313325014

^ Eglash, Ron. African Fractals: Modern Computing and Indigenous Design. New Brunswick: Rutgers University Press 1999.

^ Nelson, Bryn. Sophisticated Mathematics Behind African Village Designs Fractal patterns use repetition on large, small scale, San Francisco Chronicle, Wednesday, February 23, 2009.

^ IRON IN AFRICA: REVISING THE HISTORY(2002). Unesco.

^ Iron in Sub-Saharan Africa by Stanley B. Alpern (2005). pp. 71

^ Duncan E. Miller and N.J. Van Der Merwe, 'Early Metal Working in Sub Saharan Africa' Journal of African History 35 (1994) 136; Minze Stuiver and N.J. Van Der Merwe, 'Radiocarbon Chronology of the Iron Age in Sub-Saharan Africa' Current Anthropology 1968.

^ How Old is the Iron Age in Sub-Saharan Africa? by Roderick J. McIntosh, Archaeological Institute of America (1999)

^ Iron in Sub-Saharan Africa by Stanley B. Alpern (2005)

^ Davidson, Basil(1994). The Search for Africa, History, Culture, Politics. New York: Random House, pp. 57(8), ISBN 0 8129 2278 6

^ Ehret, Christopher (2002). The Civilizations of Africa. Charlottesville: University of Virginia, pp. 136, 137 ISBN 0-8139-2085-x.

^ Collins, Rober O. and Burns, James M. The History of Sub-Saharan Africa. New York:Cambridge University Press, p. 36. ISBN 9780521687089.

^ Collins, Rober O. and Burns, James M. The History of Sub-Saharan Africa. New York:Cambridge University Press, p. 37. ISBN 9780521687089.

^ Shillington, Kevin. History of Africa, rev, 2nd. ed. New York: Palgrave McMillan, 2005, pp. 92 , ISBN 0-333-59957-8

^ Davidson, Basil(1994). The Search for Africa, History, Culture, Politics. New York: Random House, pp. 31,34 , ISBN 0812922786.

^ Shillington, Kevin. History of Africa, rev, 2nd. ed. New York: Palgrave McMillan, 2005, pp. 126127 , ISBN 0-333-59957-8

^ Davidson, Basil(1971). African Kingdoms. New York:Time-Life Books, pp. 146(7).

^ Oliver, Roland and Fagan, Brian M. Africa in the Iron Age, c500 B.C. to A.D. 1400. Cambridge University Press: New York, pp. 187. ISBN 0-521-20598-0.

^ "Civilizations in Africa: The Iron Age South of the Sahara". Washington State University. http://www.wsu.edu/~dee/CIVAFRCA/IRONAGE.HTM. Retrieved 2007-08-14. 

^ Africa's Ancient Steelmakers. Time Magazine, Sept. 25, 1978.

^ Shillington, Kevin(2005). History of Africa, Rev. 2nd Ed. New York: Palgrave Macmillan, pp. 36,37 , ISBN 0-333-59957-8.

^ Filer, Joyce (1996). Disease. Austin, Texas: University of Texas Press, p. 38. ISBN 0-292-72498-5.

^ Strouhal, Eugen (1989). Life in Ancient Egypt. Norman, Oklahoma: University of Oklahoma Press, pp. 243. ISBN 0-8061-2475-x,

^ Strouhal, Eugen (1989). Life in Ancient Egypt. Norman, Oklahoma: University of Oklahoma Press, pp. 24446. ISBN 0-8061-2475-x.

^ Strouhal, Eugen (1989). Life in Ancient Egypt. Norman, Oklahoma: University of Oklahoma Press, pp. 250. ISBN 0-8061-2475-x.

^ Filer, Joyce (1996). Disease. Austin, Texas: University of Texas Press p 38. ISBN 0-292-72498-5.

^ David A. King (1984). "Architecture and Astronomy: The Ventilators of Medieval Cairo and Their Secrets", Journal of the American Oriental Society 104 (1), p. 97133.

^ Durant, Will (1950), The Story of Civilization IV: The Age of Faith, Simon and Shuster, New York, pp. 3301

^ Roach, John. Antibiotic Beer Gave Ancient Africans Health Buzz, National Geographic News, May 16, 2005

^ McKissack, Frederick(1995). The royal kingdoms of Ghana, Mali, and Songhay. Macmillan: pp. 104, ISBN 0805042598

^ Djian, Jean-Michel(24-05-2007). Timbuktu manuscripts: Africa written history unveiled. Unesco:United Nations Educational, Scientific and Cultural Organization, ID 37896.

^ Waldstreicher, David. Runnaway America: Benjamin Franklin, Slavery, and the American Revolution. Macmillan: , pp. 40, ISBN 0809083140

^ Cesarean Section A Brief History(2008). National Library of Medicine, part 2

^ http://www.cdc.gov/ncidod/dvbid/YellowFever/index.html/

^ Hirst, K. Kris.Cattle (Bos spp) History of the Domestication of Cattle. About.com

^ world of caffeine. 2001. pp. Page 34.

^ Ingram AL, Doyle JJ, The origin and evolution of Eragrostis tef (Poaceae) and related polyploids: Evidence from nuclear waxy and plastid rps16. American Journal of Botany 90 (1): 116122, 2003

^ Ehret, Christopher(2002). Charlottesville: University of Virginia Press, pp. 139, ISBN 0-8139-2084-1

^ Ehret, Christopher(2002). Charlottesville: University of Virginia Press, pp. 9799, ISBN 0-8139-2084-1

^ W. Hull, Richard(1976). African Cities and Towns Before the European Conquest. New York: W. W. Norton & Company, pp. xvii, ISBN 0-393-05581-7

^ Shillington, Kevin. Encyclopedia of African history. CRC Press, pp. 1368, ISBN 1579584535

^ S. Rajagopalan, S.S.M. College of Engineering, Komarapalayam, http://www.pdexcil.org/news/40N1002/advances.htm

^ Khaminwa, Muhonjia. Clothing in Africa,Africana.com, February 7, 2010.

^ Clarke, Duncan(2003). African Textiles Introduction 5. History. Adire African Textiles.

^ P. Breunig, The 8000-year-old dugout canoe from Dufuna (NE Nigeria), G. Pwiti and R. Soper (eds.), Aspects of African Archaeology. Papers from the 10th Congress of the PanAfrican Association for Prehistory and related Studies. University of Zimbabwe Publications (Harare 1996) 461468

^ Ward, Cheryl. "World's Oldest Planked Boats", in Archaeology (Volume 54, Number 3, May/June 2001). Archaeological Institute of America.

^ Schuster, Angela M.H. "This Old Boat", December 11, 2000. Archaeological Institute of America.

^ Schuster, Angela M.H. "This Old Boat", December 11, 2000. Archaeological Institute of America.

^ Ward, Cheryl. "World's Oldest Planked Boats", in Archaeology (Volume 54, Number 3, May/June 2001). Archaeological Institute of America.

^ Aksum An African Civilization of Late Antiquity by Stuart Munro-Hay

^ "Aksum by MSN Encarta". Aksum by MSN Encarta. Encarta.msn.com. http://encarta.msn.com/encyclopedia_761564182/aksum.html. Retrieved 2009-04-21. 

^ Cultures and Customs of Somalia. Books.google.com. http://books.google.com/books?id=2Nu918tYMB8C&pg=PA13&lpg=PA13&dq=medieval+Somali+sailors&source=bl&ots=P3s1IVhLJ2&sig=5IDkjvLob321LIDJ_rZziUDr4Eo&hl=en&ei=VAGNSaz-Dce_tgenh...