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

It is impossible for a human to lick their elbow. See more

111,111,111 x 111,111,111 = 12,345,678,987,654,321. See more

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

A teaspoon of neutron star material weighs about 110 million tons. See more

Everyone is colourblind at birth. See more

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

Everyone has thirty-two teeth. See more

Lightning bolts can sometimes be hotter than the sun (about 50,000 ºF, 27,760 ºC). See more

A 'jiffy' is an actual unit of time for 1/100th of a second. See more

Rubber bands last longer when refrigerated. See more

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

The magnetic North Pole shifts by about 7 meters a day. See more

We lose half a litre of water a day through breathing. See more

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

The dioxin 2,3,7,8-tetrachlorodibenzo-p-dioxin is 150,000 times deadlier than cyanide. See more