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YELLOWSTONE NATIONAL PARK, Wyo. (AP) - A geologist at Yellowstone National Park was in the middle of a lecturing a group of colleagues on the rarity of hydrothermal explosions earlier this month when, all of a sudden, one went off just behind him. Geologist Hank Heasler was giving a lecture in the Biscuit Basin on May 17 when a hot pool behind him exploded. It spewed mud, rocks and hot water about 50 feet in the air. Geologists only know of only a handful of such unpredictable explosions in Yellowstone’s recorded history. Heasler and the others were just out of reach of the hot showering hot water and other debris.