Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
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
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118