These stone tools generally consisted of sharp flakes battered off a stone core, but early hominids also did more sophisticated flaking and retouching to sharpen and straighten their blades.

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Its most far-reaching implications are still unknown but the tools have the potential to ease fuel shortages and ecological threats that are now in such sharp focus.

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These early tools closely resembled the knives we use today, consisting of a piece of metal that was sharp on one end--the blade--and dull on the other--the tang.

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