0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Cold water weighs more than hot water.
93
Aluminum used to be more valuable than gold!
84
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
One barrel of petroleum holds 42 gallons.
20