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President Obama speaks at the National Academy of Sciences (NAS) 150th Anniversary, during their annual meeting in Washington on April 29, 2013. NAS was established in 1863 through a congressional charter signed by President Lincoln. It is a private, nonprofit organization charged with providing independent, objective advice to the U.S. government on matters related to science and technology. (Associated Press)
Photo by: Pablo Martinez Monsivais
President Obama speaks at the National Academy of Sciences (NAS) 150th Anniversary, during their annual meeting in Washington on April 29, 2013. NAS was established in 1863 through a congressional charter signed by President Lincoln. It is a private, nonprofit organization charged with providing independent, objective advice to the U.S. government on matters related to science and technology. (Associated Press)

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