Star power meets philanthropy with celeb charities

Bono battles the AIDS epidemic. Leonardo tries to make the world a greener place, and Martha has a soft spot for animals. For today's celebs, charity work is almost as much a part of the job as walking the red carpet. Famous names have become affiliated with preventing domestic violence, curing breast cancer, fixing smiles and saving farms from development. "You have to care about something other than what's going... [read full story]