Pure water (H2O) does not conduct electricity on its own.
46
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
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Pumice is the only rock that floats on water.
14
No matter how cold it gets, gasoline will not freeze.
107
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51