Sound travels fifteen times faster through steel than through air.
134
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Scientists aren't sure what color dinosaurs were.
312
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The bark of an older redwood tree is fireproof.
65