What separates us from the chimps? What makes us infinitely smart and chimps eternally stupid? Chewing:

Cooking is something we all take for granted but a new theory suggests that if we had not learned to cook food, not only would we still look like chimps but, like them, we would also be compelled to spend most of the day chewing.

Without cooking, an average person would have to eat around five kilos of raw food to get enough calories to survive.

The daily mountain of fruit and vegetables would mean a six-hour chewing marathon.

So our brains came from chewing and our language came from grooming? Makes one wonder where our big penises came from. Even a gorilla can't compete with human meat.