The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
17
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
Cold water weighs more than hot water.
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