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INSIDE THE COLLAPSE - Former trader-turned author Michael Lewis writes about a handful of Wall Street outsiders who realized the subprime mortgage business was a house of cards and found a way to make millions betting against it. He also talks about the current situation on Wall Street, the large bonuses still being paid and his predictions for the future of the industry. Steve Kroft reports. Frank Devine and Jennifer MacDonald are the producers . THIS IS A DOUBLE LENGTH SEGMENT. DEREK - Lesley Stahl profiles British musical savant Derek Paravicini, whose computer-like memory for music is matched by his creative abilities to play it in any style. Shari Finkelstein is the producer.