Actually there have been recent scientific arguments that humans are getting dumber because we are no longer selecting for intelligence.

http://www.usnews.com/news/articles/2012...ng-their-smarts

Of course I am not certain this is correct, rather I think we are seeing a divergence into various subgroups. But still, worth noting.

For who could be free when every other man's humour might domineer over him? - John Locke (2nd Treatise, sect 57)