23 October 14

The two nails I'm holding, weighing 56 grams (2 ounces), contain about 602,000,000,000,000,000,000,000 atoms of iron. Today chemists worldwide celebrate Mole Day, to honor 10 to the 23rd power, from "Avogadro's Number," 6.02 X 10²³. That is the number of atoms in one mole, or "combining weight," of an element. Eighteen grams of water -- a little more than one tablespoon -- contain 2 moles of hydrogen atoms and one mole of oxygen atoms. Ask your local chemist for more information! And please have a REALLY HUGE CELEBRATION for Mole Day!