Pumice is the only rock that floats on water.
14
Sound travels about 4 times faster in water than in air.
408
Diamonds can be shattered with a hammer.
-104
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310