Leo II was crowned Emperor of Rome at just seven years of age.
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The plans to construct the World Trade Center in New York City were announced to the public.
NASA's Ingenuity helicopter took off for its 72nd and final flight on Mars.
Massachusetts's Marconi Wireless Station Site successfully sent the first radio transmission between the US and Europe.
France revealed the world's largest commercial aircraft, nicknamed the superjumbo.
NASA's Columbia Space Shuttle completed mission STS-61-C when it landed at the Edwards Air Force Base.
