On this Day in History: December 21

2012 – Gangnam Style becomes the first YouTube video to reach one billion views.
1970 – WUTV TV channel 29 in Buffalo, New York (IND) begins broadcasting.
1953 – KOMU TV channel 8 in Columbia, Missouri (NBC/PBS) begins broadcasting.
1952 – WSBT TV channel 22 in South Bend, Indiana (CBS) begins broadcasting.
1937 – Snow White and the Seven Dwarfs, the world’s first full-length animated feature, premieres at the Carthay Circle Theatre in Los Angeles, California, one of the most famous movie palaces from Hollywood’s Golden Age.
1932 – Fred Astaire & Ginger Rogers first joint movie, Flying Down to Rio, is released.
1914 – The first feature-length silent film comedy, Tillie’s Punctured Romance released, starring Marie Dressler, Mabel Normand and Charles Chaplin.
1913 – Arthur Wynne’s “word-cross,” the first crossword puzzle, is published in the New York World.