Take a few minutes to watch it, it's an excellent presentation.
***
Follow-up thought to the follow-up thought: people have got to stop sending me TED talks. It's like I'm back in High School, watching all the attractive kids go to the cool party -- and I'm not allowed to attend.
Only now....um....hold on...this metaphor may not work....the attractive kids are huuuuge nerds...and, um...the cool party is, um, TED.