President Barack Obama listens to Center for Transportation Research Director Ann Schlenker, as he tours Argonne National Laboratory in Argonne, Ill., Friday, March 15, 2013. Argonne is the first US science and engineering research national laboratory, and it remains on of the nation’s largest. (AP Photo/Pablo Martinez Monsivais)

Associated Press
President Barack Obama listens to Center for Transportation Research Director Ann Schlenker, as he tours Argonne National Laboratory in Argonne, Ill., Friday, March 15, 2013. Argonne is the first US science and engineering research national laboratory, and it remains on of the nation’s largest. (AP Photo/Pablo Martinez Monsivais)
President Barack Obama listens to Center for Transportation Research Director Ann Schlenker, as he tours Argonne National Laboratory in Argonne, Ill., Friday, March 15, 2013. Argonne is the first US science and engineering research national laboratory, and it remains on of the nation’s largest. (AP Photo/Pablo Martinez Monsivais)
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