In this moving yet pragmatic talk, Kevin Bales explains the business of modern slavery, a multibillion-dollar economy that underpins some of the worst industries on earth. He shares stats and personal stories from his on-the-ground research -- and names the price of freeing every slave on earth right now.

Behold, courage. These speakers have the fortitude to stand up to some of the world's greatest injustices.

North Korea is one of the most isolated countries in the world. So it’s exceptionally rare to hear a first-hand account of life there -- in English, no less. In today’s brave talk, given at TED2013, Hyenseo Lee gives a riveting account of what it was like to grow up in North Korea. “I thought my country was the best on the planet,” she says. ...