I've read of theories that ancient man's brain development came so quickly because we learned to throw spears at prey. We nearly doubled our brain size in a ver

I've read of theories that ancient man's brain development came so quickly because we learned to throw spears at prey. We nearly doubled our brain size in a very short time period (anthropologically speaking.) It was thought that it resulted from developing a sense of lay calculus by throwing the spears. One anthropologist I heard speak said he thought that would mean major league pitchers are the pinnacle of human evolution. :) Of course, that gentleman consumed more psychedelics than anyone I've ever known, so I'm not so sure. More to the point, what if this is the beginning of a very fast evolutionary change?