The Disadvantage of Smarts(economist.com)
economist.com
The Disadvantage of Smarts
http://www.economist.com/blogs/prospero/2012/06/quick-study-satoshi-kanazawa-intelligence
http://www.economist.com/blogs/prospero/2012/06/quick-study-satoshi-kanazawa-intelligence
This implies that the evolutionary selection of intelligence was sexual selection, that our brains evolved like a peacock's tail.