They are elements that occupy a select portion of the periodic table and are
so essential to America's economic and military might that they are stored
in the National Defense Stockpile in case of all-out war. We plan a riveting
visit. Some of the vital heavy metals that we survey include copper, uranium,
lead, zinc, and nickel. We also take a look at superalloys--consisting of
steel combined with chromium, cobalt, and dozens of other heavy metals - that
resist corrosion and perform increasingly elaborate functions. From Earth to
space, from cosmetics to vitamins, in a million different ways, heavy metals
are here to stay!

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