Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The only letter not appearing on the Periodic Table is the letter "J".
180
Cold water weighs more than hot water.
93
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Because heat expands the metal, the Eiffel Tower always leans away from the sun.
79
If the chemical sodium is dropped into water it will immediately and violently explode.
67