Want to hangout with Robert Ballard, James Cameron, Jane Goodall, and explorers from all seven continents? Join +National Geographic for a global Hangout on Air this Sunday, January 13, at 1 p.m. ET (6 p.m. UTC).
Learn about the explorers' expeditions at http://natgeo125.appspot.com/ and use #NatGeo125 to ask your questions.
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