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

The grey whale migrates 12,500 miles from the Artic to Mexico and back every year.

The longest glacier in Antarctica, the Almbert glacier, is 250 miles long and 40 miles wide.

Wireless' communications took a giant leap forward in 1962 with the launch of Telstar, the first satellite capable of relaying telephone and satellite TV signals.

One in every 2000 babies is born with a tooth.

When Krakatoa erupted in 1883, its force was so great it could be heard 4,800 kilometres away in Australia.

The air at the summit of Mount Everest, 29,029 feet is only a third as thick as the air at sea level.

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