Samira Mohyeddin thought she knew pretty much everything about the Iranian revolution - a revolution that caused her own family to leave the country for Canada when she was four years old. So when she saw that the photojournalist David Burnett had published a book on his own time in Iran in the 1970s, she couldn't wait to pore over his photos. Samira got to page 126, and a shot of a group of women standing in a stadium. And that's when she saw her mom, Zarrin. Zarrin and the other women were at an anti-revolution rally that, after the photo was taken, would turn violent. 100 days later, Zarrin left the country. And she had no idea that the photo existed.