A scientific satellite needs only 250 watts of power, the equivalent used by two hour light bulbs, to operate.

The Space Shuttle always rolls over after launch to alleviate structural loading, allowing the shuttle to carry more mass into orbit.

The smallest transistor is 50-nanometres wide – roughly 1/2000 the width of a human hair.

In the 6th century BC Greek mathematician Pythagoras said that earth is round – but few agreed with him.

The thin line of cloud that forms behind an aircraft at high altitudes is called a contrail.

An electric oven uses one kilowatt-hour of electricity in about 20 minutes, but one kilowatt-hour will power a TV for 3 hours, run a 100-watt bulb for 12 hours, and keep an electric clock ticking for 3 months.