Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
65
Pumice is the only rock that floats on water.
14
Most dust particles in your house come from dead skin.
48
The left ear is more responsive to words of love and emotion whispered into it than the right.
40
Hot water can freeze faster than cold water.
181
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
199
Nylon is made from coal and petroleum.
42
Cellophane is not made of plastic. It is made from a plant fiber, cellulose, which has been shredded and aged.
44