Sound travels fifteen times faster through steel than through air.
134
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Pumice is the only rock that floats on water.
14
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
Each day is longer than the previous on by 0.00000002 seconds which is 13 seconds each century!
116
A cesium atom in an atomic clock beats over nine billion times a second.
43
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Indoor pollution is 10 times more toxic than outdoor pollution.
62