Since the 1970s, thousands of people across the globe have reported hearing a strange humming sound incessantly pulsating in their ears – and we’re not talking about tinnitus. In fact, some claim the weird sound has persisted for so long that it has started driving them nuts, disturbing their concentration during the day and haunting them in their sleep. The strange hum has turned into such a compelling mystery that there’s an entire website dedicated to studying and documenting the phenomenon. There you’ll find an expansive map where recreational researchers have crowdsourced hundreds of locations where they’ve experienced the hum. Yet nobody has managed to decisively…

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