The average temperature at 40,000 feet above sea level is -60 F.
56
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Balsa wood is classified as a hard wood!
41
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Most dust particles in your house come from dead skin.
48
Aluminum used to be more valuable than gold!
84
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108