The bark of an older redwood tree is fireproof.
65
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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
If you are locked in a completely sealed room, you will die of carbon dioxide poisoning first before you will die of oxygen deprivation.
117
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
In zero gravity, a candle's flame is round and blue.
16
According to studies, men change their minds two to three times more often than women.
72