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James_K comments on Rationality Quotes: July 2010 - Less Wrong
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The nearest example I can think of is the alchemical concept of transmuting one metal into another. This process is of course central to nuclear reactions, but pre-20th Century was considered physically impossible.
Lightning was the weapon of Zeus. Now it can be controlled by electrical engineers.
The Aztecs thought the sun was a god. Now plasma physicists can produce light via similar means.
Those are good examples.
Magnetism?