Rincon de la Vieja National Park , Costa Rica

Members of the Costa Rican Red Cross team searching for U.S. citizen David Gimelfarb check their searching patterns in the Rincon de la Vieja National Park on Monday. Gimelfarb, a 28-year-old doctoral student, disappeared Aug. 11 while hiking alone in the mountainous park in northern Costa Rica.
Kent Gilbert / Associated Press
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