The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Nylon is made from coal and petroleum.
42
Indoor pollution is 10 times more toxic than outdoor pollution.
62
If the chemical sodium is dropped into water it will immediately and violently explode.
67
Hot water can freeze faster than cold water.
181
Airports that are at higher altitudes require a longer airstrip due to lower air density.
39
The average temperature at 40,000 feet above sea level is -60 F.
56
For every gallon of sea water, you get more than a quarter pound of salt.
45