Will our future brains be smaller?

The speed at which we react to threatening situations can have life or death implications. In the more primitive past, it could have meant escaping a wild animal; today it might mean swerving to avoid a head-on car crash.

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<p><a href="http://www.physorg.com/news134795711.html">Will our future brains be smaller?</a></p> <p>The speed at which we react to threatening situations can have life or death implications. In the more primitive past, it could have meant escaping a wild animal; today it might mean swerving to avoid a head-on car crash.</p>