Scientists have dated sharp-edged flakes of store found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years agao, pushing back by more than 150,000 years the earliest date when it is known that humans made store tools.
A When it is known that humans made B at which it is know that humans had made C at which humans are know to be making D that humans are known to be making E of humans who were known to make
