I'd read long ago that the infusion of meat into our ancestors' diet is thought to be responsible for increasing brain size. But now, it could be that cooking our meat may have led to increased intelligence.
Take that you pesky vegans! If you'd had your way, we'd still be tree-dwellers!*
*Okay, okay...I don't really have anything against vegetarianism...just the fanatical vegans who want to convert the world and froth at the mouth against us meat murderers. So I poke fun...a lot.