Sound travels about 4 times faster in water than in air.
408
One barrel of petroleum holds 42 gallons.
20
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
Cold water weighs more than hot water.
93
0.3% of solar energy from the Sahara is enough to power the whole of Europe.
310
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
