This photo taken Monday, Nov. 12, 2012 and released by the National Geographic Society on Thursday, Jan. 10, 2013, shows writer Paul Salopek posing for a portrait in the National Geographic headquarters in Washington. Two-time Pulitzer Prize-winning reporter Paul Salopek has taken the first steps of an unimaginably long walk - a 21,000-mile (34,000-kilometer) journey from Ethiopia to Argentina expected to last seven years. (AP Photo/National Geographic, Rebecca Hale) NO SALES ONE TIME USE ONLY NO ARCHIVE

Associated Press
This photo taken Monday, Nov. 12, 2012 and released by the National Geographic Society on Thursday, Jan. 10, 2013, shows writer Paul Salopek posing for a portrait in the National Geographic headquarters in Washington. Two-time Pulitzer Prize-winning reporter Paul Salopek has taken the first steps of an unimaginably long walk - a 21,000-mile (34,000-kilometer) journey from Ethiopia to Argentina expected to last seven years. (AP Photo/National Geographic, Rebecca Hale) NO SALES ONE TIME USE ONLY  NO ARCHIVE
This photo taken Monday, Nov. 12, 2012 and released by the National Geographic Society on Thursday, Jan. 10, 2013, shows writer Paul Salopek posing for a portrait in the National Geographic headquarters in Washington. Two-time Pulitzer Prize-winning reporter Paul Salopek has taken the first steps of an unimaginably long walk - a 21,000-mile (34,000-kilometer) journey from Ethiopia to Argentina expected to last seven years. (AP Photo/National Geographic, Rebecca Hale) NO SALES ONE TIME USE ONLY NO ARCHIVE
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