Feb 12 2012: Probably Golgi and Ramón y Cajal (1906; individual staining of neurons although it only affects specific ones for some reason) but really, it's hard to say a favorite because each is so important. Good and bad science is hard to differentiate though. I mean, you can look at it empirically or through how much the discovery contributed to our understanding of a subject. The engineering thing could also be applied to math; I don't know if it's true but I heard the story behind math is because the creator was jealous that a mathetician stole his girlfriend away. There could be a similar story behind engineer or just that no one has argued for it long enough.
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