At NYC sci fest, asking 'What if we're holograms?'

Brian Greene, a string theorist known for bringing his complex field of science to the masses, and Tracy Day, his wife and organizing partner behind World Science Festival, pose in Times Square, New York, Wednesday May 19, 2010. (AP Photo/Bebeto Matthews)

May 29, 2010 2:42:22 PM PDT
Brian Greene works in a world where scientific reasoning rules all and imagination leads to the most unlikely truths.