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President Barack Obama talks with Elana Simon, 18, of New York City, about her cancer research project that is part of the 2014 White House Science Fair exhibit on display in the State Dining Room of the White House in Washington, Tuesday, May 27, 2014. Simon, at age 12, was diagnosed with fibrolamellar hepatocellular carcinoma, a little-known form of cancer that affects the liver. After surviving the disease, she now helps scientists research the genetics behind it. Obama was celebrating the student winners of a broad range of science, technology, engineering and math (STEM) competitions from across the country. (AP Photo/Susan Walsh)

President Barack Obama talks with Elana Simon, 18, of New York City, about her cancer research project that is part of the 2014 White House Science Fair exhibit on display in the State Dining Room of the White House in Washington, Tuesday, May 27, 2014. Simon, at age 12, was diagnosed with fibrolamellar hepatocellular carcinoma, a little-known form of cancer that affects the liver. After surviving the disease, she now helps scientists research the genetics behind it. Obama was celebrating the student winners of a broad range of science, technology, engineering and math (STEM) competitions from across the country. (AP Photo/Susan Walsh)

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