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The Pocono Mountains Perched on the edge of a platform 40 feet above the grassy Camp Harlam grounds in Kunkletown, Pa., 13-year-old Jake Lord steels himself for his first plunge down the zipline. Attached to the line next to him, Michael Holzman, a visiting rabbi from Reston, Va., prepares himself for the same inaugural experience. A few minutes later, both...