Technology | 2009.08.21
Early Humans Used Heat-Treated Stone ... - New York Times
 CTV.ca | Early Humans Used Heat-Treated Stone for Tools New York Times Tool manufacturers know that sometimes you have to heat-treat a material to make it harder or stronger. Ancient toolmakers learned that ... Early Africans Heat-Treated Rock to Make Better Tools Study: Fire used to make tools 75000 years ago Early humans forged tools from fire |
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