LOL, he talks about the monkey people in Africa knowing how to knap.

Obsidian is nothing to scoff at. That stuff is sharp as fuck. I was trying out some flint knapping and cut the hell out of myself because I had no clue what I was doing.

Some surgeons actually pay for guys like this to make them surgical tools since they are so damn sharp you can't really get a metal blade that can complete and the incisions heal better/faster too.