What recent discoveries have amateur mathematicians made?
Can anyone give historical examples of people outside of mathematics that have contributed to the literature? I'm particularly interested in academics from distant fields (humanities, social sciences) who have developed their hobby into a noteworthy contribution, but would also be interested in those from nearer fields (sciences), where the math was not part of their area of research, and those not affiliated with academia at all.
I'm a math graduate student with hopes to contribute to philosophy or humanities someday. I'm just curious how impenetrable different disciplines are, and realised I know of no examples like this.
Please forgive me if this is a duplicate, I couldn't find another like it, and think others may find it interesting as well.