There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Iron weighs more after it rusts.
16
Pumice is the only rock that floats on water.
14
A 'jiffy' is an actual unit of time for 1/100th of a second!
66
Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
A ball of glass will bounce higher than a ball made of rubber.
73