Giraffes often sleep for only 20 minutes in any 24 hours. They may sleep up to 2 hours (in spurts - not all at once), but this is rare. They never lie down.

The thermometer was invented in 1607 by Galileo.

If every star in the Milky Way was a grain of salt they would fill an Olympic sized swimming pool.

A dog's sense of smell is 1,000 times more sensitive than a humans.

Light would take 0.13 seconds to travel around the Earth.

If our Sun were just inch in diameter, the nearest star would be 445 miles away.

The molecular structure of DNA was first determined by Watson and Crick in 1953.

Wounds infested with maggots heal quickly and without spread of gangrene or other infection.