When Did Human Ancestors Start Using Tools?
Briefly

Paleoanthropologists have long sought the origins of human technological innovation, with Lucy's discovery 50 years ago reshaping our understanding of our unique ability to create tools.
Jane Goodall's groundbreaking research revealed that chimpanzees modify organic tools, leading to the assertion that we must reconsider what it means to be human and a toolmaker.
Read at www.scientificamerican.com
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