Nikola Tesla had such severe OCD that he rarely slept, was an...

Nikola Tesla had such severe OCD that he rarely slept, was an extreme germaphobe, hated round objects, refused to touch hair, was fixated on doing things in sets of 3, had to have 18 napkins on his table during meals, counted his steps wherever he walked, and had a “violent aversion against the earrings of women.” 

He also died a virgin (probably) and fell in love with a pigeon.

(Source, Source 2, Source 3)

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