It's commonly believed that that grandpa has more knowledge than his young whippersnapper of a grandkid. But do wrinkles on the face really relate to wrinkles on the brain?
WHAT'S INSIDE: INSIDE THE MIND
- The Human Brain
Sleepwalking is an intriguing phenomenon. How can a person be unconscious but still coordinate his or her limbs? And how do we know when we're really awake?
Your little brother might think it's funny to put a rubber snake in your pocket or jump out from a closet in a dark hallway, but your heart rate might disagree. Is it possible to be scared out of both your wits and your life?