Trueno wrote:
I was thinking something more like an enormous pencil sharpener with maybe a flint wedged in it or something. It must have been sooo Neanderthal to drag your stick along the ground.
you're overthinking it.
Somebody just broke a chip of a rock, and there it was …. a hard sharp blade.
And then they used the blade to sharpen a stick like we would use a pen knife to sharpen a pencil.
Then they use the sharp stick to whatever (stab game, or stab an enemy human).
Simple, but it changed the world.