Almost all physics crackpots are men. Men standing atop Mt. Stupid are blessed with supreme confidence. Crackpots reside there permanently.pic.twitter.com/siOFKFCzHi
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Newton is perhaps the signal example of a true expert whose aversion to tiresome controversy led him to refrain from attempting to express more than a tiny fraction of what he knew. But he is merely an extreme; most great masters die with most of their music still within them.
Newton is also a great example of an expert who might now be considered a crackpot for his work on alchemy and biblical chronology - the two fields that occupied him most in his later life. But standards change, so I wouldn't say someone into alchemy back then was a crackpot.
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