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More than a century ago, the Chinese paleontologist and archaeologist Pei Wenzhong found an unusual trove in the same cave near Beijing where he found the skulls of the early hominin Peking Man. Along with the remains of a 700,000-year-old Homo erectus, Wenzhong unearthed a collection of 20 quartz crystals, one of which was a "perfectly faceted, smoky quartz crystal," the researcher Juan Manuel García-Ruiz wrote in a 2018 paper. In 1931, Wenzhong brought the quartz back to Beijing. "After [...]