Pumice is the only rock that floats on water.
14
Cold water weighs more than hot water.
93
A single cup of gasoline, when ignited, has the same explosive power as five sticks of dynamite.
57
One ragweed plant can release as many as one billion grains of pollen!
51
Balsa wood is classified as a hard wood!
41
Your brain is 80% water.
525
A single speck of dust is half way in size between a subatomic particle and the Earth.
15
No matter how cold it gets, gasoline will not freeze.
107