Jodi Cobb knew nothing about modern-day slavery before she read a blurb in the Washington Post. Quickly, she was thrown into a dark world, one where she often felt her own safety was at risk. Her remarkable photos in National Geographic in September 2003 exposed this horrific human-rights abuse to light, and the magazine received the biggest reader response in more than 15 years. "The most gratifying thing is it's not just people saying 'nice story.' People were moved to action," Jodi says. But the story still haunts her because she knows that 27 million people are still enslaved