Hum
Haven't heard the hum but I certainly believe some can hear it. Not all of us hear things the same -- pitch, frequency, etc. I have a challenge hearing some pitches but I'm far from deaf (had my hearing checked not long ago).
We definitely differ in our senses: I recall a recent internet challenge where you looked at a photo of a dress and shared what colors you saw. Gold/white or otherwise. (Gold/white for me).
I don't envy those that hear the hum as I'm sure they lose sleep.
GB
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