Photojournalist James Nachtwey sees his TED Prize wish come true, as we share his powerful photographs of XDR-TB, a drug-resistant strain of tuberculosis that's touching off a global medical crisis. Learn how to help at http://www.xdrtb.org Photojournalist James Nachtwey is considered by many to be the greatest war photographer of recent decades. He has covered conflicts and major social issues in more than 30 countries. Full bio: http://www.ted.com/index.php/speakers/james_nachtwey.html

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