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Scoop.it!
Here are some leading theories about the why the human brain has been getting smaller since the Stone Age. Visit Discover Magazine to read this article and other exclusive science and technology news stories. 
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Scoop.it!
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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