This September 2017 photo shows Robert Levin, 96, of Rochester, Minn., and his daughter, Carolyn McIntosh. Levin is one of the few remaining former scientists connected with the Manhattan Project. The project was focused on building the atomic bomb that was dropped on the Japanese city of Hiroshima in 1945 and marked the end of World War II. (Elizabeth Nida Obert/The Rochester Post-Bulletin via AP)
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