Sir Isaac Newton was a great man - and a first-class eccentric and occultist. His erratic behavior and mental decline near the end of his life is thought to be due to mercury poisoning (mercury being an important alchemical element he used in attempts to create the “Philosopher’s Stone”). Significant concentrations of mercury were found in samples of his hair subjected to analysis.
I’d wager that even with a compromised brain, he was still smarter than a lot of the naysayers I’ve read.
The most famous mathemeticians of which have been proven to be fraudlent in their most publicized assertions about such.