• 50th Anniversary: John Glenn's Earth Orbit

    John Glenn poses on the flight deck of the space shuttle Discovery with former astronaut Bob Cabana, the director of the Kennedy Space Center in Florida, Feb. 17, 2012. Glenn lobbied NASA for a second flight after Friendship 7, and finally got to fly on a Discovery flight in 1998.
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Anuar Patjane Floriuk/National Geographic Traveler Photo Contest
PHOTO: Researchers working with the Atlantic White Shark Conservancy identified two great white sharks on July 28, 2015.
Wayne W.Davis/Atlantic White Shark Conservancy