From the time he was 12 years old, Craig Kielburger has been fighting for the rights of children. Oprah's Angel Network teamed up with his organization, Free The Children, to help build schools around the world.

Oprah says, "Because of what reading and learning has done for me, I believe that education is the door to freedom, that it changes everything."

"There are 130 million children between the ages of five and 11 who don't have the opportunity to go to school. Many of them are girls, many of them in rural areas, especially in Africa," Craig says.