Going Online in the Age of Conspiracy Theories

A video claiming Back to the Future predicted 9/11 is the latest in a long and often bizarre tradition of questioning key moments in history.

In the weeks and months after the attacks of September 11, 2001, there was an image that circulated heavily online, mostly via email. It showed a man who appeared to be standing on the observation deck of one of the World Trade Center towers. Pictured over his right shoulder was the nose of a jet. A tourist had captured a photo of one of the highjacked airplanes moments before it struck the tower, the story went, and the camera found in the debris at Ground Zero was all that remained.