http://sciencenow.sciencemag.org/cgi/content/full/2009/402/2
See also this article about Kanzi the chimp making stone tools. Part of the issue is how sophisticated the tool has to be before you call it a manufactured tool.
Meanwhile, the Creationists are still not explaining why there are no modern mammals or humans in the same geologic layers where we find dinosaurs, if we were all created in the same week.
Removal of multiple blades like that from a core of such coarse material requires a sophisticated knowledge of shock wave propagation and the ability to predict force vector resultants -- and very careful selection and control of the point and force of impact.
Such multiple blade removals simply cannot occur via any natural mechanism. They were performed by an intelligent and well-coordinated being.
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Note how the charlatan, "Brian Thomas, M.S." attempts to cast the honesty of scientists who correct their knowledge base as better data is acquired -- as a "weakness" in their knowledge.
How charmingly smug of him to sneer at his intellectual superiors -- simply because his (and "Bishop" Ussher's) misinterpretation of a few words in Genesis has supposedly given him the "whole TRUTH".
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The God who created this universe doesn't need such hucksters and hustlers "defending" Him.
Wonder how the figured out that they were intelligently designed? Didn’t think that sort of thing was possible /s.