A shift in metabolic gear in our ancient ancestors means that humans burn calories much faster than any other primate,giving us energy for larger brainsThe hefty brains that set humans apart from other apes came into being when our ancient ancestors massively ramped up their metabolism, scientists say.
The shift in metabolic gear, and after the human lineage split from other primates,gave humans enough energy to run larger brains, hold children in rapid succession, or live longer lives,the researchers found.
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Source: theguardian.com