In zero gravity, a candle's flame is round and blue.
16
Sound travels about 4 times faster in water than in air.
408
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Nearly 50% of the world's scientists are assigned to military projects.
71
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
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