Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
Iron weighs more after it rusts.
16
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
Most dust particles in your house come from dead skin.
48
A cesium atom in an atomic clock beats over nine billion times a second.
43
Pumice is the only rock that floats on water.
14