This undated photo released by Brown University shows former president Donald F. Hornig, who died Monday, Jan. 21, 2013. He was 92. . Hornig worked on the atomic bomb and was a scientific adviser to three U.S. presidents. (AP Photo/Brown University)

Associated Press
This undated photo released by Brown University shows former president Donald F. Hornig, who died Monday, Jan. 21, 2013. He was 92.  . Hornig  worked on the atomic bomb and was a scientific adviser to three U.S. presidents. (AP Photo/Brown University)
This undated photo released by Brown University shows former president Donald F. Hornig, who died Monday, Jan. 21, 2013. He was 92. . Hornig worked on the atomic bomb and was a scientific adviser to three U.S. presidents. (AP Photo/Brown University)
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