3min chapter

Twenty Thousand Hertz cover image

Endless Hertz

Twenty Thousand Hertz

CHAPTER

The Mystery Sound Throwdown Returns After Last Episode's Mystery Sound

The mystery sound throwdown will return after these messages. Last week, Mark Stevens correctly guessed the sound of a Slack notification called the knock brush. In 2016, Slack tweeted that this was a goofy tribute to one of their beloved coworkers. If that knock brush sound haunts you in your sleep, Slack has a bunch of other options - including hummus.

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