One cubic foot of gold weighs more than 1,200 pounds!
78
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Marie Curie, the Nobel prize winning scientist who discovered radium, died of radiation poisoning.
57
Cold water weighs more than hot water.
93
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
39
The only letter not appearing on the Periodic Table is the letter "J".
180