Pumice is the only rock that floats on water.
14
The inventor of the Super Soaker squirt gun was a NASA Scientist who also helped develop the Stealth Bomber and the Galileo mission to Jupiter.
7
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The bark of an older redwood tree is fireproof.
65
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
The gas that gives rotten eggs their distinctive foul smell may slow ageing and block damaging chemical reactions inside cells, according to scientists in China.
5