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This exhibit focuses on the Hanford Site and its role in the Manhattan Project. It feature exhibits on the B Reactor — the world's first plutonium production reactor — and its importance, models of the reactor and surrounding buildings, a documentary film ("Hanford's Secret Wartime Mission"), and vignettes and education materials on the history of the Hanford site. The exhibit was developed in partnership with the B Reactor Museum Association, the Hanford Reach National Monument Heritage and Visitor Center, and the Columbia River Exposition on History, Science and Technology.