Matt Ridley, author of The Rational Optimist website (and numerous books), presented at TED Global this year. The whole video is worth watching, of course, but I really like the [slightly out of context] quote below.
We've gone beyond the capacity of the human mind to an extraordinary degree. And by the way, that's one of the reasons that I'm not interested in the debate about I.Q., about whether some groups have higher I.Q.s that other groups. It's completely irrelevant. What's relevant to a society is how well people are communicating their ideas, and how well they're cooperating, not how clever their individuals are.