Africa: Could a rusty coin re-write Chinese-African history?

It is not much to look at - a small pitted brass coin with a square hole in the centre - but this relatively innocuous piece of metal is revolutionising our understanding of early East African history, and recasting China's more contemporary role in the region. A joint team of Kenyan and Chinese archaeologists found the 15th Century Chinese coin in Mambrui - a tiny, nondescript village just north of Malindi on Kenya's north coast.