Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
A cesium atom in an atomic clock beats over nine billion times a second.
43
Columbia University has developed an artificial tree that passively soaks up carbon dioxide from the air using "leaves" that are 1,000 times more efficient than true leaves that use photosynthesis.
15
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
Sound travels about 4 times faster in water than in air.
408
Aluminum used to be more valuable than gold!
84
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
A cubic yard of air weighs about 2 pounds at sea level.
31