Heroes: Everyday people changing the world
Harmon Parker & Kakenya Ntaiya
Sign of Hope
Five-year-old Monley was pulled from the rubble eight days after an earthquake struck Haiti in 2010. Anderson Cooper explains why he remains his hero.
Still fighting the good fight
After seven decades on TV, Richard Attenborough is still at the vanguard of conservationism -- and Mother Nature needs his help.
The human body in space
Astronauts Scott and Mark Kelly went through a year of experiments -- one in space, one on Earth. Their sacrifice is unraveling the mysteries of the body.