Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The most expensive material on the planet is antimatter - worth $62.5 trillion per gram.
18
Diamonds can be shattered with a hammer.
-104
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
The earth is approx. 6,588,000,000,000,000,000 tons.
175
One barrel of petroleum holds 42 gallons.
20