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Can you hear that? It\u2019s like a car \u2013idling in the distance\u2013 or a plane on a tarmac, with a tinge of oil crackling in a pan. Since the 1970s a mysterious sound has tormented communities across the globe and confounded those curious to find its source. With no recording of it in existence, and only 2 to 10 percent of affected area populations able to hear it, this hum is a sonic mystery for the ages that we\u2019ll try to get to the bottom of in this episode.\xa0