[JasonC]

Archelogists recently discovery a hardware store outside an American city. They found screws that had flat driving tangs at the back, others with little crosses. They concluded that religious differences led to the collapse of 21st century American civilization, the great religious war between the "phillips heads" and the "slotters".

These people are smoking too much of the wrong substances. The existence of two classes of tools does not remotely imply the existence of rival waring exclusive human societies. Those are indeed likely enough, on ordinary evidence from human history. Without any implication that each group only used one tool. The knives were probably for skinning and other such detail work, the heavier stones for hunting, wood chopping, etc.

The whole story is simply another example of archelogists replacing missing evidence with personal fantasies.

[Pharmboy]

Excellent point...and the (physical) anthropologists are often worse.