It takes about 20 seconds for a red blood cell to circle the whole body. See more

There are more bacteria in your mouth than the human population of the U.S.A. and Canada combined. See more

After billions of years, black holes become white holes and they spit out all the things they sucked up. See more

A boeing 747's wingspan is longer than the Wright brothers' first flight (120 feet/36 meters). See more

The light from your computer screen streams at you at almost 186,000 miles a second. See more

The cruise liner, Queen Elizabeth 2nd, burns a gallon of diesel for each 6 inches that it moves. See more

You can't kill yourself by holding your breath. See more

Some large clouds store enough water for 500,000 showers. See more

Everyone is colourblind at birth. See more