A cubic yard of air weighs about 2 pounds at sea level.
31
Pure water (H2O) does not conduct electricity on its own.
46
The average temperature at 40,000 feet above sea level is -60 F.
56
Your brain is 80% water.
525
The only letter not appearing on the Periodic Table is the letter "J".
180
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Indoor pollution is 10 times more toxic than outdoor pollution.
62