What is the mysterious 'global Hum' – and is it simply noise pollution? | Curio

What is the mysterious 'global Hum' – and is it simply noise pollution?

7 mins | Mar 22, 2019

Up to 4% of people are said to hear a strange low-pitched noise known as the Hum, but no source has ever been found. City life is said to be one possible cause - The Guardian shed light on the strange phenomenon.

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From The Guardian