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In 1919, he established the Salem School, which emphasised experiential education, or learning by doing.
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There were also periods of silence, to allow participants the time for reflection. In 1933, forced out by the Nazis.
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He founded Gordonstoun.
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Lawrence Holt, a student's father who owned a shipping company, asked Hahn to design a course to develop sailors' strength and stamina.
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Holt named it,Outward Bound , the term for a ship or person departing on a journey, and in 1941, he and Hahn opened the first course.