Sonic Bubbles: Escaping noise, but at what cost?
Twenty Thousand Hertz
The Last Episode's Mystery Sound
In the 20th century, as industry ramped up and our cities expanded, the world began to fill up with noise. Noise canceling headphones were invented in 1978 by Ammar Bose of the famed Bose Company. If you know that sound, then be sure to submit your guess at mystery.20k.org. To get a peek at these t-shirts, go to 20k.org slash shop.
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