Over 2 million years ago, promitive humans were using large, round stone choppers and hand axes, hand sized rocks with one end flaked into a sharp edge or point.
Used for cutting meat and scraping skins to chopping wood and digging hole; building shelters and homes.
Later triangular points, probably used as knives.
They aslo figured out that fixing a stone implement into a handle (or haft) of bone or antler gave them better leverage.
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