Yogesh Gianchandani, a researcher at the University of Michigan, has developed a tiny wireless Geiger counter that can be used in a network to cover large areas like stadiums or malls and distinguish between harmful and non harmful sources of radiation. And since they're so small (about the size of a postage stamp, as you can see), they can be placed in inconspicous areas, which is both more feasible and much less likely to freak people out than a bunch of dudes in white lab coats walking around with ticking boxes. While development of the device seems to be well on track, it's probably still a ways off from going into production, which means you'll need to look to other solutions if you want to be prepared for when the Commies finally drop the big one.

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Postage stamp-sized wireless Geiger counter