." ♪ thomas: do we really have to pass a law that tellbanks, you cannot give a loan to mee who can'tt back? warren: i have 20 iq points over him, and he is getting rich and i'm not. that drives people crazy and it will continue to drive people crazy 100 years from now and 500 years from now. steven: as soon as you had two cavemen with caves, one of them looked at the other and said, "why is his cave bigger? and why does he have shrubs and we don't?" i look at you and i compare you to me. ♪ ♪ terre: welcome back to "big problems, big thinkers." i am terre blair. after the near collapse of global markets, former federal reserve chairman alan greenspan said, "no two crises have anything in common except human nature." and that is where we pick up with pulitzer prize-winning journalist thomas friedman. what part did we as individuals play in what went wrong? what can we do better? thomas: well, when someone comes to you, selling you a home mortgage, and telling you the only thing they need to do is check if you can fog up a knife, and not show your income statement, that is a pretty good