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From my understanding, it's actually the physical proximity. If you've ever had a cell phone near speakers, you've probably heard the humming too. It's simply the electromagnetic interference because the frequency happens to match those used by the speaker. That's MY understanding, but it could be entirely wrong.
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"I'm typing on a computer of science, which is being sent by science wires to a little science server where you can access it. I'm not typing on a computer of philosophy or religion or whatever other thing you think can be used to understand the universe because they're a poor substitute in the role of understanding the universe which exists independent from ourselves." - Willravel
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