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 come from dead skin.
48
Iron weighs more after it rusts.
68
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
Scientists are now able to grow 'beating' heart tissue in a lab!
162
For every gallon of sea water, you get more than a quarter pound of salt.
45
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6