Pumice is the only rock that floats on water.
14
One barrel of petroleum holds 42 gallons.
20
If the chemical sodium is dropped into water it will immediately and violently explode.
67
The average home creates more pollution than does the average car.
33
Sound travels fifteen times faster through steel than through air.
134
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
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