Sean Morey, then with the Arizona Cardinals, celebrates after blocking a punt against the Seattle Seahawks in 2007. Morey, who suffers from post-concussion syndrome, retired from the NFL in 2010 on the advice of doctors.
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New Jersey Gov. Chris Christie listens during a Jan. 9 news conference in which he denied any knowledge of lane closings on the George Washington Bridge when they occurred in September.
Andrew Ng and Daphne Koller, Stanford University computer science professors who started Coursera, pose for a photo at the Coursera office in Mountain View, Calif., on Aug. 2, 2012.