You use over 70 muscles to say one word. See more

Astronaut Neil Armstrong first stepped on the moon with his left foot. See more

Your muscles make up about one-half of your body weight. See more

The thumbnail grows the slowest; the middle nail grows the fastest. See more

About 70 percent of your body weight is water. See more

We know more about the surface of the moon than we do about the bottom of the ocean. See more

The electric chair was invented by a dentist. See more

Zero point energy is a source of energy which is released when atoms stop moving, at -273 Celcius. See more

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