Graduate Degree in Ninja Studies
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It is a thing now.
https://www.cnn.com/2020/06/30/asia/ninja-studies-graduate-intl-hnk-scli/index.html
‘A Japanese man has become the first person in the world to hold a master's degree in ninja studies, after completing a graduate course that involved learning basic martial arts and how to stealthily climb mountains.
Genichi Mitsuhashi, 45, spent two years studying the history, traditions and fighting techniques of ninjas -- the mysterious covert agents of feudal Japan -- at the country's Mie University.
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Doctorate in Ninja Studies. That's gotta be next.
Ninjologist. Or Ninjician.