Every year lightning kills 1000 people.

Neutron stars are so dense that a teaspoonful would weigh more than all the people on Earth.

The deepest part of any ocean in the world is the Mariana trench in the Pacific with a depth of 35,797 feet.

The call of the humpback whale is louder than Concorde and can be heard from 500 miles away.

Humans have 46 chromosomes, peas have 14 and crayfish have 200.

The largest ever hailstone weighed over 1kg and fell in Bangladesh in 1986.

Astronauts cannot belch - there is no gravity to separate liquid from gas in their stomachs.

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