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EBR-I nuclear reactor control room. The Experimental Breeder Reactor No. 1 (EBR-I) was the first nuclear reactor in the world to produce usable energy. It was built near Arco, Idaho, USA, and operated from 1951 to 1963. It was designated a US National Historic Landmark in 1965 and added to the National Register of Historic Places in 1966. (KEYSTONE/SCIENCE PHOTO LIBRARY/JIM WEST/SCIENCE PHOTO LIBRARY)