A Mongol horde led by Batu Khan conquered and sacked the Russian city of Ryazan.
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John Wayne Gacy was arrested.
President Coolidge signed a bill authorizing The Boulder Canyon Project Act, which allowed for the construction of what is known today as the Hoover Dam.
The first full-length animated feature film, 'Snow White and the Seven Dwarfs,' premiered.
Psy's music video for 'Gangnam Style' surpassed one billion views on YouTube, becoming the first video to do so in the website's history.
The groundbreaking TV soap opera 'Sua Vida Me Pertence' premiered in Brazil.
