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.

Two very popular and common objects have the same function, but one has thousands of moving parts, while the other has absolutely no moving parts - an hourglass and a sundial.

Oil tycoon, John D. Rockefeller, was the world's first billionaire.

AMAZING FACTS