The largest meteorite craters in the world are in Sudbury, Ontario, canada and in Vredefort, South Africa.

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.

One million, million, million, million, millionth of a second after the Big Bang the Universe was the size of a …pea.

Wounds infested with maggots heal quickly and without spread of gangrene or other infection.

The speed of light is generally rounded down to 186,000 miles per second. In exact terms it is 299,792,458 m/s (metres per second – that is equal to 186,287.49 miles per second).

The Earth is 4.56 billion years old…the same age as the Moon and the Sun.

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

The world's smallest winged insect, the Tanzanian parasitic wasp, is smaller than the eye of a housefly.