A single speck of dust is half way in size between a subatomic particle and the Earth.
15
In zero gravity, a candle's flame is round and blue.
16
A cubic yard of air weighs about 2 pounds at sea level.
31
Pumice is the only rock that floats on water.
14
One ragweed plant can release as many as one billion grains of pollen!
51
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
At room temperature, the average air molecule travels at the speed of a rifle bullet.
55
A 'jiffy' is an actual unit of time for 1/100th of a second!
66