Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Indoor pollution is 10 times more toxic than outdoor pollution.
62
The average home creates more pollution than does the average car.
33
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
Pumice is the only rock that floats on water.
14
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89