One cubic foot of gold weighs more than 1,200 pounds!
78
Pumice is the only rock that floats on water.
14
In zero gravity, a candle's flame is round and blue.
16
Most dust particles in your house come from dead skin.
48
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Most dust particles in your house are made from dead skin!
67
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13