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

Venus is the only planet in the solar system to spin backwards. See more

The telescope on Mount Palomar, California, can see a distance of 7,038,835,200,000,000 million miles. See more

Like fingerprints, everyone's tongue print is different. See more

You cannot sneeze with your eyes open. See more

Your skin weighs about 3.2 kg. See more

It is impossible for a solar eclipse to last for more than 7 minutes 58 seconds. See more

Rain falls at 11 km/h. See more

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