Human fossil skulls and thigh bones

Climate changed the size of our bodies and, to some extent, our brains

08 July 2021

The average body size of humans has fluctuated significantly over the last million years and is strongly linked to temperature. Colder, harsher climates drove the evolution of larger body sizes, while warmer climates led to smaller bodies. Brain size also changed dramatically but did not evolve in tandem with body size.

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