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I used to hear transistors very clearly. One of the things I knew as a kid from anther room or sometimes even from outside was if someone had their TV on. The n

• ajnin 9y ago
  What you heard was probably not transistors but the flyback transformer that TVs use to generate the high voltage needed by cathode ray tubes. They generally operate around 16-18kHz, in the high range of human hearing that young people can hear easily but most people lose that ability as they age.
• JCharante 9y ago
  > One weird memory is that I remember detecting objects in silent and dark room at home if they were like 10cm from my head. Even with eyes closed. I'm not sure if it's real or kids magical thinking. But it could have been very high pitched/ambient noise echoing from surfaces. I think that's something that is common, but I have no idea what it's called. If you hold something (especially if it's sharp) up to someone's forehead but not close enough for it to make contact with them, they will get this weird sensation building up in their forehead. Or at least I and a lot of the people I've tried it with have. It wasn't in a completely dark room so I bet you could see the shadow through your eyelids but it's still pretty weird.