Archaeologists at the State University of New York at Stony Brook in the United States found 149 sharp slices and anvils with a history of 3.3 million years on the shore of Lake Turkana in northwest Kenya, 700,000 years earlier than the existing tools, making them the oldest stone tools in the world. Scientists recently said that these stone tools are 500,000 years earlier than the oldest human fossils that have been unearthed, and this discovery may rewrite the history of human evolution.

Homo sapiens, that is, modern people, has a history of about 200 thousand years, while Homo, to which Homo belongs, has a history of about 2.8 million years. Therefore, the history of the stone tools unearthed this time is about 500 thousand years earlier than that of the human genus, which has led scientists to guess who made these stone tools. Some experts have put forward possible answers. First of all, these stone tools were made by undiscovered primitive people. Second, stone tools may have been made by flat-faced Kenyans about 3 million years ago, or extinct primitive people and Australopithecus afarensis.