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Not entirely recognized as true anymore, but in terms of beeing revolutionary at its time I think Freudianism (and possibly Marxism) are the only things that can compete with evolution. Most scientific theories (relativity, heliocentricity, quantum mechanics, etc) might have been revolutionary ideas within their fields. But they were not nearly as strongly reacted to in the broader culture as the previous 3 theories.

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Marxism as the most revolutionary scientific theory of all time? Ummmm, okay.