Apples, not caffeine, are more efficient at waking you up in the morning. See more

Most dust particles in a US house are made from dead skin. See more

The first owner of the Marlboro Company died of lung cancer. See more

Your system of blood vessels is over 60,000 miles long. That's long enough to go around the world more than twice! See more

The heart beats about 100,000 times each day. See more

Blood is about 78 percent water. See more

Heroin used to be a cough medicine for children. A German company (Bayer) registered heroin as a trademark. See more

Julius Caesar, Alexander the Great, and Dostoyevsky were all epileptics (aka brain disorder). See more

In fact, Einstein couldn't speak fluently when he was nine. His parents thought he might be retarded. See more