From the BBC:
For decades, hundreds of people worldwide have been plagued by an elusive buzzing noise known as “the Hum”. Some have blamed gas pipes or power lines, others think their ears are faulty. A few even think sinister forces could be at work.
“It’s a kind of torture, sometimes you just want to scream,” exclaims retired head teacher Katie Jacques.
Sitting in the living room of her home in the suburbs of Leeds, the 69-year-old grandmother describes the dull drone she says is making her life a misery.
Wow! My sister is somewhat sensitive to electrical sounds – she can hear electric motors and fluorescent lights and such. I hope this isn’t the kind of thing she has to deal with!