The twin towers of the World Trade Center billow smoke after hijacked airliners crashed into them early 11 September, 2001. Henny Ray Abrams/AFP/Getty Images hide caption

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Kelly Thompson, a mentor at Siemens, gives apprentices an orientation of the factory. The program provides on-the-job training in manufacturing. Courtesy of Siemens Energy Inc. hide caption

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Two students walk in front of Stanford Memorial Church on the Stanford University campus in Stanford, Calif. Paul Sakuma/AP hide caption

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