0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
One barrel of petroleum holds 42 gallons.
20
Balsa wood is classified as a hard wood!
41
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Diamonds can be shattered with a hammer.
-104
Optical illusions occur when what the eyes see conflicts with what the brain expects.
75
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Scientists have developed a microparticle filled with oxygen that can be injected into the blood stream, enabling us to live without breathing.
21