Truly, stone is a much more subtle and flexible material than it appears to be...with considerable practice almost anybody should be able to learn to make simple tools. He will not make very good ones. He will not make them with the speed and virtuosity of Francois Bordes, the French prehistorian who has made a specialty of this craft...and he will certainly make nothing that Homo-Erectus would have been proud of. In fact, todays would-be toolmaker can only be impressed by the enormous skill that every ancestral craftsman must have had.
--F. Clark Howell, "Early Man"