Who dropped the bomb?

Science  11 Mar 2016:
Vol. 351, Issue 6278, pp. 1138-1140
DOI: 10.1126/science.351.6278.1138

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Many experts believe that a nuclear attack on U.S. soil is more likely than ever; a bomb set off in a city street is seen as the most likely scenario. The conceivable need to unmask a perpetrator, and mount an effective response, is propelling the emerging area of postdetonation forensics. Scientists are devising new sensors, manufacturing artificial fallout to hone analytical techniques, and studying how the glass formed in the furnace of an atomic blast would vary depending on the nature of the bomb and the city where it detonated. Discreet Oculus, a sensor array that would collect data during a nuclear attack on a U.S. city, was tested in the first exercise of its kind last summer.