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Eating habits and food processing skills from around two million years ago humans to and develop language. Researchers from Harvard University say that learning to meat up and using basic stone tools to food were crucial steps in our evolutionary process. The fact that we food up or pounded and crushed it we needed less time for chewing. This our mouths more free time to language and communicate. The researchers estimate that cutting up meat and other food early humans as many as 2.5 million chews per year. In contrast, the chimpanzee half of its day chewing, which means it has less time to communicate.

The researchers also said the shape of our face because we to chew less. Our jaws and teeth became smaller because we had to cut up food. Professor Daniel Lieberman said: "We from having snouts and big teeth and large chewing muscles to having smaller teeth, smaller chewing muscles, and snoutless faces. Those changes, and others, for the selection for speech and other shifts in the head, like bigger brains." Dr Lieberman raw goat meat to his theory. He said: "You chew and you chew and you chew and you chew, and nothing ." He that to some extent, slicing meat into smaller pieces before chewing, " the simplest technology of all".