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Parasites, he says, would have become a problem only when shelters were first established. But hairlessness, he says, evolved before shelters did. Some research suggests older women sex pictures it evolved when walking upright became popular among hominids more than 2m years ago. Mr Dunbar supports the cooling theory, and argues that when humans invaded the open plains, hair loss doubled the distance they could travel on a pint of water. Moreover, the presence or absence of hair clearly affects insulation because hair length changes on animals in different environments: elephants in older women sex pictures cold places became the woolly mammoth. And it is older women sex pictures now thought that humans started wearing clothes rather recently—work on the genetics and evolutionary origins of clothes lice suggests they first appeared some time between 30,000 and 114,000 years ago—certainly far too late to explain why humans lost most of their hair.
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