Science

Music was sent down a telephone line for the first time in 1876, the year the phone was invented.

Sound travels through water 3 times faster than through air.

A square piece of dry paper cannot be folded in half more than 7 times.

Air becomes liquid at about minus 190 degrees Celsius.

Liquid air looks like water with a bluish tint.

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

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

Radio waves travel so much faster than sound waves that a broadcast voice can be heard sooner 18,000 km away than in the back of the room in which it originated.