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$60 BILLION FRAUD - Medicare and Medicaid fraudsters are cheating U.S. taxpayers out of an estimated $90 billion a year using a billing scam that is surprisingly easy to execute. Steve Kroft investigates. Ira Rosen and Joel Bach are the producers. FIGHTING FOR A CURE - More Americans are suffering from epilepsy than Parkinson's, cerebral palsy and multiple sclerosis combined . Katie Couric reports on a disease that may not be getting the attention it deserves. Kyra Darnton is the producer. TYLER PERRY - When Hollywood refused to produce his films his way, Tyler Perry started his own studio in Atlanta and now his movies - including the popular "Madea" series - are drawing huge audiences. Byron Pitts profiles the new and unlikely movie mogul. Ruth Streeter is the producer.