I'm such a big fan of Colin McLarty. Here he is giving an historical lecture on the birth of Topos theory. Who would have thunk it, that Kansas in the 50s would be ground zero of a mathematical revolution that is only now becoming palpable to the many.
https://www.youtube.com/watch?v=vmcbm5FxRJE&ab_channel=GraduateMathematics
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