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  1. The Hum - Wikipedia

  2. The World Hum Map and Database Project - Dr Glen MacPherson

  3. 'The Hum' Noise: Mystery Sound Is Invading Towns - What Is It?

  4. The Hum, a worldwide mystery sound explained - KALW

  5. Theories behind The Hum phenomenon reported by only some …

  6. Cracking the mystery of the ‘Worldwide Hum’ - The Conversation

  7. 'The Hum': Unexplained Buzzing Sound or Collective Delusion? - The Atlantic

  8. Who, What, Why: Why is 'the hum' such a mystery? - BBC News

  9. How the Hum Works - HowStuffWorks

  10. Is "the Hum" a Scientific Fact or a Mass Delusion? - The New …