Pumice is the only rock that floats on water.
14
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
The only letter not appearing on the Periodic Table is the letter "J".
180
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Pure water (H2O) does not conduct electricity on its own.
46
According to scientists, the color of the cup that we're drinking from can alter our perception of the actual taste of the drink.
12
A cubic yard of air weighs about 2 pounds at sea level.
31
The average home creates more pollution than does the average car.
33