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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- Why was the hurdy-gurdy linked to beggars?
“The hurdy-gurdy was linked to beggars and street musicians.”
Reference: Encyclopaedia Britannica
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How does a hurdy-gurdy make sound?
A hurdy-gurdy makes sound when the player turns a crank that spins a rosined wheel against the strings, working like a violin bow.
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.