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.

The risk of being struck by a falling meteorite for a human is one occurence every 9,300 years.

Alfred Nobel invented dynamite in 1866.

The fastest speed a falling raindrop can hit you is 18mph.

In the 14th century the Black Death killed 75,000,000 people. It was carried by fleas on the black rat.

The Universe contains over 100 billion galaxies.

Without its lining of mucus your stomach would digest itself.

A salmon-rich, low cholesterol diet means that Inuits rarely suffer from heart disease.