Sound travels about 4 times faster in water than in air.
408
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Pure water (H2O) does not conduct electricity on its own.
46
The smell of freshly cut grass is actually a plant distress call.
31
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
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118