give it time. Soon they discover rocks can be shaped :D
I just don't see it as a very significant find.
We are very intelligent and started using tools. So it doesn't come as a surprise other strains of "prehumans" did the same.
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They have taught captive chimps to knock flakes of one rock using another rock and using it to cut things.
However the chimps revert to just throwing the rock on the floor because that also produces flakes which work just as well, if all you want is something quick to cut with.
I didn't know that. They are smart.