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"GPS might at first seem like an unlikely source for nuclear test detection." Actually, it makes total sense. So much sense that the creators of GPS put sensors in the satellites to do this...

"GPS satellites carry a set of nuclear detonation detectors consisting of an optical sensor (Y-sensor), an X-ray sensor, a dosimeter, and an electromagnetic pulse (EMP) sensor (W-sensor), that form a major portion of the United States Nuclear Detonation Detection System" http://en.wikipedia.org/wiki/Global_Positioning_System

That's interesting, I did not know that.

The approach in the article is in fact quite novel, though.

They're actually detecting the shock wave in the atmosphere. Not even something "easy" like the seismic shock wave.

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