Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Hot water can freeze faster than cold water.
181
Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
304
Forensic scientists can determine a person's sex, age, and race by examining a single strand of hair.
101
The Earth's atmosphere weighs about 5.5 quadrillion tons.
108
For every gallon of sea water, you get more than a quarter pound of salt.
45
Scientists in Germany have developed a candy that doesn't cause cavities.
11
