The Tip Top
in 1884, a precious metal, aluminum, topped the Washington Monument. At the time an ounce of aluminum cost as much as silver, and there was only one place to get it in the US. The use of that rare metal helped spark the aluminum industry. A cheap method of extraction soon brought plummeting prices and ultimately, the use of aluminum in patio furniture.
In 1859, only a king could afford an aluminum helmet. Today it's cheap enough to tip your own top with a tinfoil hat.
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