Los Alamos wartime badge photo: Richard Feynman
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Attribution
Los Alamos National Laboratory, <a rel="nofollow" class="external text" href="http://www.lanl.gov/about/history-innovation/badges.php">Historic Badges</a>;  <a rel="nofollow" class="external text" href="http://www.lanl.gov/about/history-innovation/wartime/images/ProjectYBadges/f/feynman-richard_p.gif">specific link</a>