The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
Pumice is the only rock that floats on water.
14
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
The force of a suction cup is calculated using F=AP.
15
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
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