Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
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
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155