Discovery suggests early humans were wielding sophisticated stone tools at least 300,000 years earlier than thought.
A rare haul of picks, flakes and hand axes recovered from ancient sediments in Kenya are the oldest remains of advanced stone tools yet discovered.
Archaeologists unearthed the implements while excavating mudstone banks on the shores of Lake Turkana in the remote north-west of the country.
The largest of the tools are around 20cm long and have been chipped into shape on two sides, a hallmark of more sophisticated stone toolmaking techniques probably developed by Homo erectus, an ancestor of modern humans.
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