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
Even if you're very ticklish, you probably are incapable of tickling yourself. Learn why.
Humans can express emotion in a variety of ways, from the written word to spoken communication. But what is it about music and art in particular that has the power to move us?