Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
65
Pumice is the only rock that floats on water.
14
The brain case [of Neanderthals] on the average was more than 13 percent larger than that of the average of modern man
61
A coal power station puts 100 times more radiation into the air than a nuclear power plant producing the same amount of energy.
7
The banana plant cannot reproduce itself. It can be propagated only by the hand of man.
155
No matter how cold it gets, gasoline will not freeze.
107
Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65