Indoor pollution is 10 times more toxic than outdoor pollution.
62
Sound travels about 4 times faster in water than in air.
408
Some toothpastes and deodorants contain the same chemicals found in antifreeze.
38
One barrel of petroleum holds 42 gallons.
20
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Each day, up to 150 species of life become extinct.
-23
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7