> that's only 80 mental mutations between us and the Homo species that made this axe. So these guys were just about as smart as us. I don't understand that.

> that's only 80 mental mutations between us and the Homo species that made this axe. So these guys were just about as smart as us. I don't understand that. How could relative intelligence be inferred from just the number of mutation that occurred? I'm no biologist, but from what I understand a single genetic mutation might have a huge effect or a very minor effect.