Dr. Steven Chu Dr. Steven Chu

Massachusetts Institute of Technology scientist Ernest Moniz is introduced by President Obama as the nominee to run the Energy Department, Monday at the White House. Mandel Ngan/AFP/Getty Images hide caption

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Mandel Ngan/AFP/Getty Images

Energy Secretary Steven Chu tours the Vogtle nuclear power plant in Waynesboro, Ga., last year. David Goldman/AP hide caption

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David Goldman/AP