Hot water can freeze faster than cold water.
181
Most dust particles in your house come from dead skin.
48
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
In zero gravity, a candle's flame is round and blue.
16
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
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
One barrel of petroleum holds 42 gallons.
20