Are brains shrinking to make us smarter?

 

February 6, 2011 by Jean-Louis Santini

Photo illustration of a brain scan. Human brains have shrunk over the past 30,000 years, puzzling scientists who argue it is not a sign we are growing dumber but that evolution is making the key motor leaner and more efficient.

Human brains have shrunk over the past 30,000 years, puzzling scientists who argue it is not a sign we are growing dumber but that evolution is making the key motor leaner and more efficient.

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Are brains shrinking to make us smarter?