Spooked? Scientist explains why we see what isn't there

Seeing ghosts? Richard Wiseman, a psychologist and professor at the University of Hertfordshire, says don’t worry: There’s no such thing -- and you're not the only one who's seeing spooky sights. In his latest book, "Paranormality: Why We See What Isn’t There," Wiseman, a former magician, looks at psychic phenomena through the prism of science.  Click here.