At that time, the original human genus (Homo erectus) used an Acheulean-shaped grip ax about 20 cm in length made by crushing the circumference of volcanic rock and a pickaxe-shaped tool as a stone tool. Some of them were near Lake Turkana in northern Kenya, Africa.
■ Around 1.76 million BC
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Hiloyuki Kubota / 久保田啓敬
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