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You know, you just don’t notice the cosmic rays and the other sources of background radiation unless you have the Geiger counter on for a while. You can go months without thinking about them, then turn on a survey meter and they quickly become an annoyance:
beep
beep beep
beep
beep beep beep beep
beep....
beep
beep beep
beep
beep beep beep beep
beep....
