Charles Darwin embarks on the HMS Beagle, "Howdy Doody" makes its TV debut, Apollo 8 splashes down after orbiting the Moon, and the Soviet Union occupies Afghanistan, all on this day.
1966: The Cave of Swallows, the largest known cave shaft in the world, is discovered in Aquismón, San Luis Potosí, Mexico. The floor of the cave is a 1,092-foot freefall drop from the lowest side of the opening, with a 1,214-foot drop from the highest side.
Harry How/Getty Images
Ethan Miller/Getty Images for Clear Channel
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Jason Kempin/Getty Images
Adele.com via CNN
Thierry Chesnot/Getty Images
Columbia Pictures Television
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