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
Addictions to substances such as drugs and alcohol have ruined the lives of people all over the world. Read about current views and ideas on addiction.
The authors of chain e-mails often tell you to smile more -- with the added claim that it takes more muscles to frown. Ever questioned this piece of wisdom? We've got an answer for you.