Iron weighs more after it rusts.
68
The force of a suction cup is calculated using F=AP.
15
One barrel of petroleum holds 42 gallons.
20
According to studies, men change their minds two to three times more often than women.
72
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7