Developing intelligence of our ancestors may have come at a price
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A model of Homo Heidelbergensis, which may have been the direct ancestor of Homo sapiens WHPICS / ALAMY A timeline for genetic changes in millions of years of human development…
Human development
Our big brains may have evolved due to placental sex hormones
Exposure to hormones in utero can affect human brain growth Peter Dazeley/Getty Images The human brain is one of the most complex objects in the universe – and that complexity…