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

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

Leonardo Da Vinci invented the scissors. See more

The electric chair was invented by a dentist. See more

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

Zero point energy is a source of energy which is released when atoms stop moving, at -273 Celcius. 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 telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000 million miles. See more