Tony Robbins discusses the "invisible forces" that motivate everyone's actions -- and high-fives Al Gore in the front row.

Tony Robbins makes it his business to know why we do the things we do. The pioneering life coach has spoken to millions of people through his best-selling books and three-day seminars.

Source: http://www.ted.com/talks/tony_robbins_asks_why_we_do_what_we_do.html