Salma Hayek made national headlines after a goodwill trip to Sierra Leone (she was there to see firsthand a leading cause of death in the developing world: tetanus) where she breastfed another woman's malnourished baby.
Brad Pitt caught a mild case of Meningitis during a trip to Ethiopia where he accompanied Angelina Jolie to pick up their newly adopted daughter Zahara.
Bono is one of the world's best-known philanthropic performers and has visited Africa's most disease-ridden areas countless times to help raise awareness.