VIDEO: Up to 18% of Americans say they've seen a ghost, but this could offer a scientific explanation. A specific tone, called the 'ghost frequency' could create a vibration that shakes the eye and crates visual distortions. Read»
VIDEO: Tom Wainwright, author of Narconomics, is the former Mexico City bureau chief for The Economist. He explains the financial reason why some drug cartel members get head-to-toe tattoos.