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The control room of the X-10 graphite reactor, the world's second reactor after Enrico Fermi's so-called Chicago Pile, is seen at Oak Ridge National Laboratory in Oak Ridge, Tennessee, USA, 11 June 2015. Built in secret during the Manhattan Project, the reactor supplied plutonium to nuclear scientists working at Los Alamos. The X-10 will become part of the soon-to-be-established Manhattan Project National Historical Park.