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

Female black widow spiders eat their males after mating.

Each rubber molecule is made of 65,000 individual atoms.

Koalas sleep an average of 22 hours a day, two hours more than the sloth.

Quasars emit more energy than 100 giant galaxies.

Every year lightning kills 1000 people.

In October 1999 an Iceberg the size of London broke free from the Antarctic ice shelf .

At over 2000 kilometres long The Great Barrier Reef is the largest living structure on Earth.