A cubic yard of air weighs about 2 pounds at sea level.
31
Iron weighs more after it rusts.
16
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
Most dust particles in your house are made from dead skin!
67
The average temperature at 40,000 feet above sea level is -60 F.
56
Cold water weighs more than hot water.
93