Hundreds of years ago gold and silver were rare and valuable, and today they are rare and valuable. Iron and tin were cheap and plentiful and today they are cheap and plentiful. However, there is one metal that was once the rarest and expensive metal in the world, and today it is one of the cheapest and most plentiful. Learn more about aluminum, how it was once rare and then became abundant, on this episode of Everything Everywhere Daily.
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