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THE BIG GAMBLE - Lesley Stahl reports on the proliferation of gambling to 38 states and its main attraction, the slot machine, newer versions of which some scientists believe may addict their players . Ira Rosen and Joel Bach are the producers. SILVER OR LEAD - Byron Pitts reports on the murder of the mayor of a Mexican city, where powerful drug gangs seem to be giving authorities a choice of "silver or lead" - join us and we will pay you or don't and we'll kill you. David Schneider and Joyce Gesundheit are the producers. A LIVING FOR THE DEAD - Marilyn Monroe, James Dean and Elvis are dead and so is Michael Jackson . But as Steve Kroft reports, they are very much alive when it comes to earning money for their estates. Frank Devine is the producer.