Modern humanlike brains may have evolved surprisingly late, about 1.7 million years ago, a new study suggests.
How Did We Get to Be Human? - The New York Times
Peering into Little Foot's 3.67 million-year-old brain
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2021 – Wikipedia
Ancient humans may have had apelike brains even after leaving Africa
Big-brained ancient ape was in no hurry to grow up
Early Humans Born With Big Brains
Anthropology, Page 8 of 66
An Evolutionary Timeline of Homo Sapiens, Science