Comments by "z08840" (@z08840) on "The Slow Mo Guys" channel.

  1. it's not "u" - it's greek mu...
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  2.  @PunchCounterpunch_Lizzy  look closer - it has a little tail on the left side. But yes, in english text where greek letters are not convenient or unavailable we use "u" instead
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  3. modern hard drives are neither waterproof nor airtight - they have a vent hole to equalize air pressure inside to the atmospheric pressure and for thermal expansion, and this hole has a felt air filter to protect plates from outside's dust
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