Human origins: ‘Little Foot’ fossil’s big journey out of Africa

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“The main hypothesis is that in modern humans, these vessels are involved in thermoregulation – preventing our brain from becoming too hot. With Little Foot, the brain was the same size as a chimpanzee’s. It was only later in evolution that the brain grew dramatically. But at some point, something had to change in the vascular system, too. So the fact that we can see these vessels in Little Foot is quite promising,” she said.