One thing Dr Falotico and Dr Proffitt have noticed is that some of the sharp flakes that fly off when hammer meets anvil look identical to Stone Age blades made by human beings.

Falotico和Proffitt博士注意到了一件事—当铁锤与铁砧碰撞时所脱落的一些锋利薄片看起来和石器时代人类制造的刀片一模一样。