Physicists from MIT designed a pocket-sized cosmic ray muon detector that costs just $100 to make using common electrical parts, and when turned on, lights up and counts each time a muon passes through. The design is published in the American Journal of Physics.

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Physicists from MIT designed a pocket-sized cosmic ray muon detector that costs just $100 to make using common electrical parts, and when turned on, lights up and counts each time a muon passes through. The design is published in the American Journal of Physics.