Pumice is the only rock that floats on water.
14
Iron weighs more after it rusts.
16
One third of the electricity produced on earth is used to power electric light bulbs!
75
Dr.Jonas Salk, the man who came up with the cure for polio, didn’t patent the drug. This made the drug more affordable to the general public, and he lost out an an estimated $7 billion dollars for himself.
41
According to studies, men change their minds two to three times more often than women.
72
The average temperature at 40,000 feet above sea level is -60 F.
56
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
The only letter not appearing on the Periodic Table is the letter "J".
180