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

One in every 2000 babies is born with a tooth.

It takes 8 minutes 17 seconds for light to travel from the Sun's surface to the Earth.

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

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.

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

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.

Each person sheds 40lbs of skin in his or her lifetime.