Newton invented calculus while on leave from school, the school having closed because of plague fears. He was “on vacation “ for 2 years and it was during this break that he knocked out calculus. And then he failed to tell anyone about it. Years later a colleague visiting Newton complained about the inability to describe orbits mathematically and Newton said something like, “oh I’ve got something for that”, dug around in his piles of papers, pulled out his Calculus and handed it over to his amazed colleague.
Wow...!
Newton and Tesla are my heroes