Educational YouTube Rabbit-Holes

I've dedicated myself to being as lazy as possible today 🙂 Does anyone have any good suggestions for YouTube rabbit holes to fall into that won't rot my brain 😵‍💫

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SunshineGirl · 36-40, F

Gresham College (they have their own yiutube channel). There is an archive of public lectures by academics on every subject from history to astronomy, maths to philosophy.