The lie detector, invented in 1921 by John Augustus Larson, was first used in the Netherlands.
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Leo II was crowned Emperor of Rome at just seven years of age.
Microsoft announced its plans to acquire Activision Blizzard for $68.7 billion.
NASA's Ingenuity helicopter took off for its 72nd and final flight on Mars.
The Paris Peace Conference began in France.
NASA's Columbia Space Shuttle completed mission STS-61-C when it landed at the Edwards Air Force Base.
