In this Wednesday, March 27, 2019 photo, Yoav Negev, and Boaz Langford, researchers at the Israel Cave Research Center of the Hebrew University of Jerusalem, examine salt stalactites hanging from the ceiling in the Malham Cave at the Dead Sea in Israel. Israeli researchers say they believe this to be the world’s longest salt cave, a network of twisting passageways at the southern tip of the Dead Sea. (Photo by Ariel Schalit/AP Photo)
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