What Is the Mysterious ‘Global Hum’ – and Is It Simply Noise Pollution?
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 one possible cause. The Guardian Philip Jaekl Could air traffic be a cause of the Hum? … An airplane prepares to land at Heathrow airport. Photo by Chris …
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