Tool use was once considered a defining characteristic of the genus Homo. This view was supplanted after discovering evidence of tool use among chimpanzees and other primates, dolphins, and crows. For example, researchers have observed wild chimpanzees using basic foraging tools, pestles, levers, using leaves as sponges, and tree bark or vines as probes to fish termites. West African chimpanzees use stone hammers and anvils for cracking nuts, as do capuchin monkeys of Boa Vista, Brazil.
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- Many discoveries also arose from pure chance, like the discovery of penicillin as a result of accidental lab contamination.
- Around 2 Mya , they learned to make the first stone tools by hammering flakes off a pebble, forming a sharp