[RightWhale]

The problem with using tree pitch as glue, as any Neanderthal knew, is that the usable temperature range is limited. Too hot in the woods and the stone falls off the stick. Too cold in the woods and the stone breaks off the stick. An axe head needs to be bound to the stick with well-chewed sinew. There has been progress in the past 300,000 years: the modern perforated axe head has overcome some of the problem, but axe heads still sometimes fly off the stick.

[BradyLS]

There has been progress in the past 300,000 years: the modern perforated axe head has overcome some of the problem, but axe heads still sometimes fly off the stick.

And here I thought the damn things were just cheap!