People can make dents in the outer shell of human knowledge without having PhDs though. As in to discover something new and revolutionary, plenty of great scientists have and likely many more will continue to.
Well Rotating a rotor on a generator is the most convenient way to make electricity with parts that last a long amount of time. Also doesn’t help that we use AC power while other sources like photovoltaic produce DC power which needs to be converted to be used.
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