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

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

Leonardo Da Vinci invented the scissors. See more

The telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000 million miles. See more

Astronauts are not allowed to eat beans before they go into space because passing wind in a spacesuit damages them. See more

The typical laboratory mouse runs 2.5 miles per night on its treadmill. See more

10% of human dry weight comes from bacteria. See more

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