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“The Hum” is a strange phenomenon reported by people across the planet for decades. Those who can hear it (2-4% of the population, according to one study) say it’s a persistent low-frequency sound with no obvious source. It’s been attributed to everything from atmospheric phenomena to power lines to secret government operations and aliens. Researchers now say they’ve discovered the cause of the Hum, let’s take a look.
Paper: https://doi.org/10.1371/journal.pone.0326818
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