Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin.
When you walk down a steep hill, the pressure on your knees is equal to three times your body weight.
4.5 pounds of sunlight strike the Earth each day.
The only letter not appearing on the Periodic Table is the letter "J".
The hair of an adult man or woman can stretch 25 percent of its length without breaking.