Agile is about how we shouldn't use bureaucratic processes and put developers in control of their own timelines. Scrum is agile living long enough to see itself becoming the villain in its own story.
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Sound is made of wiggling air. Electrons can also be wiggled. If you can convert air-wiggles to electron wiggles, you can send the electric ones down a wire, and do the conversion again to get the air-wiggles back. This is really all a microphone/speaker setup does.