Sound travels about 4 times faster in water than in air.
408
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
A ball of glass will bounce higher than a ball made of rubber.
73
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
For every gallon of sea water, you get more than a quarter pound of salt.
45