bonus question: how did this work when phone calls were still a relatively new thing?
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Phone calls convert Sound, which is pressure waves traveling through the air, into electrical signals which can travel at around the speed of light or so, until they get to the other end where they are converted back into pressure waves on the other end.
It worked basically the same way back then as it does now, but these days we can send a phone signal over the internet instead of just through telephone lines.
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