Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
The smell of freshly cut grass is actually a plant distress call.
31
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
The average temperature at 40,000 feet above sea level is -60 F.
56
Your brain is 80% water.
525
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
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