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Dust Tornadoes, Icy Mountain Winds Can't Stop UM Student And His TentDisaster struck on the first day of Andrew McCarthy's expedition to climb Aconcagua -- the tallest mountain in the Western Hemisphere. The graduate student in architecture at the University of Michigan had just pitched the tent that he made himself in a valley when a 40-foot-tall dust tornado kicked up a rock and sent it flying into the side of the dwelling, puncturing a fist-sized hole in a side panel.

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