[JasonC]

No, you obviously never tried it, is all. I have. And you know absolutely nothing about the sling principle, and can only imagine much later refinements of it.

[TXnMA]

Nice try.

I keep a sling (leather, David-type) in the side pocket of my backpack -- in case I feel the need to work off a little tension by humming a few nice golf-ball-sized ROUND stones across the field or lake. I've never developed the accuracy to hit a rabbit with any consistency, but at a couple of hundred yards, I can make an armadillo's life interesting... .-)

FYI, the only thing that flat, ovoid stones like a hand-axe (which is also too large for the sling pocket) do is make a nice humming noise and curve off in any-which direction. And nice, sharp. knapped flint bifaces like those pictured would slice that leather pocket to ribbons...

Give it up; you don't know WTH you are writing about!

[TXnMA]

BTW & FYI, given a good piece of flint and a selection of hammerstones, I can replicate one of those handaxes in five minutes or so. From looking at their work, the Neanderthals could do the same.

Replicating a Clovis point takes a bit longer -- and a more sophisticated toolkit...