Leonardo Da Vinci invented the scissors. See more

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

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

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

Hummingbirds are the only birds that can fly backwards. See more

A bird "chews" with its stomach. See more

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

Snakes have two sex organs. See more

"Skepticisms" is the longest word that alternates hands when typing. See more