Stephen Hawking once tried to find potential time travellers by throwing a party and only sending out invitations after the party.
17
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
One barrel of petroleum holds 42 gallons.
20
Scientists concluded that the chicken came first, not the egg, because the protein which makes the egg shells is only produced by hens.
11
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
A cubic yard of air weighs about 2 pounds at sea level.
31
Scientists aren't sure what color dinosaurs were.
312
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18