The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
One barrel of petroleum holds 42 gallons.
20
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
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
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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
Iron weighs more after it rusts.
16
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
The sun is 330,330 times larger than the earth.
75