Thirty-five percent of the people who use personal ads for dating are already married. See more

Your system of blood vessels is over 60,000 miles long. That's long enough to go around the world more than twice! See more

Duelling is legal in Paraguay as long as both parties are registered blood donors. See more

Hydrogen is an explosive gas. Oxygen supports combustion. Yet when these are combined it is water which is used to put out fires. See more

Lobsters have pale blue blood. See more

A rat can last longer without water than a camel. See more

A rat can last longer without water than a camel can. See more

The blue whale has a heart the size of a small car and its blood vessal is so broad, that a person could swim through it. See more

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