The Human Brain Has been Getting Smaller Since the Stone Age

Yep, brains are shrinking.

Stone Age humans needed more brain power to make big leap in tool design (w/ Video)

Early modern human - Wikipedia

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If Modern Humans Are So Smart, Why Are Our Brains Shrinking?

Extinction of larger animals led to the human brain doubling in size around 30,000 years ago

During human evolution, tools have become smaller and more complex

If Modern Humans Are So Smart, PDF, Human

Frontiers When and Why Did Human Brains Decrease in Size? A New Change-Point Analysis and Insights From Brain Evolution in Ants

Why have our brains became smaller since the stone age? - Quora

Stone Age - Wikipedia

Has There Been a Decrease in Brain Size Among Modern Humans?