An ancient disease is taking on a deadly new form. James Nachtwey share his powerful photographs of XDR-TB, a newly drug-resistant strain of tuberculosis that has developed due to misused and inadequate medical treatments -- and that might be touching off a global medical crisis.

Accepting his 2007 TED Prize, war photographer James Nachtwey shows his life's work and asks TED to help him continue telling the story with innovative, exciting uses of news photography in the digital era.

Film producer Jeff Skoll (An Inconvenient Truth) talks about his film company, Participant Productions, and the people who've inspired him to do good.

The photo director for National Geographic, David Griffin knows the power of photography to connect us to our world. In a talk filled with glorious images, he talks about how we all use photos to tell our stories.