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Finds Challenge Ideas about Who Were the First Toolmakers Scientists working in the desert badlands of northwestern Kenya have found stone tools dating back 3.3 million years, long before the advent of modern humans, and by far the oldest such artifacts yet discovered. The tools, whose makers may or may not have been some sort of human ancestor, push the known date of such tools back by 700,000 years; they also may challenge the notion that our own most direct ancestors were the first to bang two rocks together to create a new technology. The discovery is the first evidence...

Researchers working in Kenya's archaeologically prolific Lake Turkana region claim to have uncovered a set of 3.3-million-year-old stone tools. That's 700,000 years older than the previous record, and predates evidence for the evolutionary origins of the genus Homo by half a million years. Above: A satellite image of Lake Turkana, where the stone tools – and many other artifacts and fossils of human ancestors – have been recovered NPR's Chris Joyce reports on the findings of Stony Brook University archaeologist Sonia Harmand and her colleagues, which were announced Tuesday at the annual meeting of the Paleoanthropology Society in San Francisco:...