Iron weighs more after it rusts.
68
Pumice is the only rock that floats on water.
14
The average temperature at 40,000 feet above sea level is -60 F.
56
Most dust particles in your house are made from dead skin!
67
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
The force of a suction cup is calculated using F=AP.
15
A ball of glass will bounce higher than a ball made of rubber.
73
Scientists in Germany have developed a candy that doesn't cause cavities.
11