Sound travels about 4 times faster in water than in air.
408
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
A cesium atom in an atomic clock beats over nine billion times a second.
43
One ragweed plant can release as many as one billion grains of pollen!
51
In zero gravity, a candle's flame is round and blue.
16
Kissing actually has the biological purpose of passing on biological information and chemical signals to assess mating possibilities and status.
9
Cold water weighs more than hot water.
93
A single speck of dust is half way in size between a subatomic particle and the Earth.
15