Who invented the theremin?
The theremin was invented in 1920 by Russian physicist Léon Theremin while he was researching sensors that detect motion.
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- When were Luray Caverns discovered?
“Luray Caverns were discovered in 1878.”
Reference: Luray Caverns
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What is the Great Stalacpipe Organ?
The Great Stalacpipe Organ in Luray Caverns, Virginia, makes music by tapping ancient stalactites, and Leland Sprinkle spent three years building it.
How did the Louisiana Purchase change the size of the US?
In 1803 the US bought the Louisiana Territory from France for about $15 million. The deal roughly doubled the size of the country.