Curtis "50 Cent" Jackson says he was looking for a way to make a difference, so he started working with the United Nations World Food Programme. Learn why Oprah says his work with the program in Africa caught her attention. Plus, find out why 50 Cent says delayed gratification is a sign of true success.

In the past four years, Christina Aguilera has married, had her first son, recorded a new album and worked to end world hunger. How this vocal superstar does it all.

Oprah Radio host Gayle King talks to Ishmael Beah about his experience as a child soldier in war-torn Sierra Leone.

The radiant, inspirational life of the first African woman to win a Nobel Peace Prize, Wangari Maathai.

The director of the Centers for Disease Control and Prevention shares shocking HIV/AIDS statistics.