"60 MINUTES" LISTINGS FOR SUNDAY JULY 8, 2007

WAKE-UP CALL -- U.S. Comptroller General David Walker says the Medicare program is on course to possibly bankrupt the treasury in the coming decades unless vast reforms to the program and the nation's healthcare system are made. Steve Kroft reports. Andy Court is the producer.

SHOOTING TIGERS -- Once 100,000 strong, just 5,000 tigers now remain wild in the Indian jungles thanks to poachers and encroaching civilization. Scott Pelley reports. Solly Granatstein is the producer.

THE LONELIEST PEOPLE - Un-adopted foster-care children are shuttled from home to home, adrift in an odyssey of loneliness. "Family Finding" locates family members who can re-establish the love and belonging they desperately need. Lesley Stahl reports, Denise Cetta is the producer.