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What was significant about George Mallory’s 1924 Everest expedition?

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On June 6, 1924, George Mallory and a less-experienced climber, Andrew (“Sandy”) Irvine, started their expedition to the summit of Mount Everest. They were spotted climbing the mountain on June 8 by other members of the expedition. After this date, Mallory and Irvine were never seen again. Mallory’s body was discovered on May 1, 1999, and Irvine’s boot is believed to have been discovered in September 2024.