American pop singer Ariana Grande joined YouTube at 13 years old.
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American tennis player John McEnroe became the first player to be expelled from the Australian Open.
America's Rocket Lab Electron sent a rocket that uses an electric-filled pump engine into orbit, making it the first of its kind.
King of France, Louis XVI, faced gruesome guillotine execution for high treason.
The first Star Trek convention was held in New York City.
The Mysterious Affair at Styles, by British crime writer Agatha Christie, was published in the UK.
