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

The researchers also said the basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory of our face changed because we needed to chew less. Our basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory and teeth became smaller because we had learnt to cut up food. Professor Daniel Lieberman said: "We went from having snouts and basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory teeth and large basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory muscles to having smaller teeth, smaller chewing muscles, and snoutless faces. Those basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory, and others, allowed for the selection for basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory and other shifts in the head, like bigger brains." Dr Lieberman chewed raw goat meat to test his basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory. He said: "You chew and you chew and you chew and you chew, and basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory happens." He added that to some basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory, slicing meat into smaller pieces before chewing, "is the basicbigchangeschewingchewscrucialextenthabitshalfjawslessmillionmouthsnothingotherprocessshapesimplestspeechtheory technology of all".