Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Iron weighs more after it rusts.
16
Pumice is the only rock that floats on water.
14
For every gallon of sea water, you get more than a quarter pound of salt.
45
There are more atoms in one teaspoon of water than there are teaspoons of water in the Atlantic Ocean.
13