Humans – We’re Jaw-Dropping Smart (Literally)

How did humans develop such big brains? It could be because our jaws got smaller and weaker, says a new theory. “A mutation 2.4 million years ago could have left us unable to produce one of the main proteins in primate jaw muscles, the team reports in this week’s Nature1. Lacking the constraints of a bulky chewing apparatus, the human skull may have been free to grow, the researchers say.”