Sound travels about 4 times faster in water than in air.
408
The weight of a carat (200 milligrams), standard unit of measurement for gemstones, is based on the weight of the carob seed.
51
In zero gravity, a candle's flame is round and blue.
16
Pumice is the only rock that floats on water.
14
Scientists in Germany have developed a candy that doesn't cause cavities.
11
The earth is approx. 6,588,000,000,000,000,000 tons.
175
Neanderthal man had a brain capacity 100cc larger than modern man's.
50
It takes a photon 170,000 years to travel from the core of the Sun to the surface, but only 8 minutes to travel the rest of the way to Earth.
6