Stone-tool makers living in southern Africa 75,000 years ago pushed the cutting edge in more ways than one. These intrepid folk sharpened the thin tips of heated stone spearheads using a forceful ...
CAPE TOWN (Reuters) - A group of prehistoric people mastered a difficult and delicate process to sharpen stones into spears and knives at least 75,000 years ago, more than 50,000 years earlier than ...
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