[logshipper]

Math:

   - 3Blue1Brown: https://www.youtube.com/c/3blue1brown

   - Numberphile: https://www.youtube.com/c/numberphile

CS:

   - Computerphile: https://www.youtube.com/user/Computerphile

Physics:

   - PBS Spacetime: https://www.youtube.com/c/pbsspacetime

Philosophy and Pop Culture:

   - Philosophy Tube: https://www.youtube.com/c/thephilosophytube

   - Folding Ideas: https://www.youtube.com/c/FoldingIdeas

   - ContraPoints: https://www.youtube.com/c/ContraPoints

Film:

   - Nerdwriter: https://www.youtube.com/user/Nerdwriter1

   - Patrick H Willems: https://www.youtube.com/c/patrickhwillems

   - Every Frame a Painting: https://www.youtube.com/c/everyframeapainting
   
   - https://www.youtube.com/c/LessonsfromtheScreenplay

[runjake]

Clickable links.

Math: - 3Blue1Brown: https://www.youtube.com/c/3blue1brown

   - Numberphile: 

https://www.youtube.com/c/numberphile

CS: - Computerphile: https://www.youtube.com/user/Computerphile

Physics: - PBS Spacetime: https://www.youtube.com/c/pbsspacetime

Philosophy and Pop Culture: - Philosophy Tube: https://www.youtube.com/c/thephilosophytube

   - Folding Ideas: 

https://www.youtube.com/c/FoldingIdeas

   - ContraPoints: 

https://www.youtube.com/c/ContraPoints

Film: Nerdwriter: https://www.youtube.com/user/Nerdwriter1

Patrick H Willems: https://www.youtube.com/c/patrickhwillems

Every Frame a Painting: https://www.youtube.com/c/everyframeapainting

https://www.youtube.com/c/LessonsfromtheScreenplay

[russellbeattie]

The amusing thing about Computerphile is it makes me wonder how inaccurate or inexact Numberphile is, as I'm very knowledgeable about the former and clueless about the latter. Computerphile is unwatchable to me, they'll just say stuff that is flat out wrong, but I eagerly await each new Numberphile vid.

There's a term for this, I can't remember. You read a newspaper article about a subject you know, and can't believe how much in it is incorrect or misconstrued, then you read another article about a different topic and it seems fine.

[smolder]

PBS Spacetime is very well done; dense with info, but concise and well explained.

[t_mann]

Trying to limit this to channels not mentioned here or in other comments yet:

Math:

Mathologer (university-level math explained with visualisations) https://youtube.com/c/Mathologer

Black Pen Red Pen (calculus problems) https://youtube.com/c/blackpenredpen

Tom Rocks Maths (in the style of a university tutorial, not surprising since the guy is a university lecturer) https://youtube.com/c/TomRocksMaths

Politics:

VisualPolitik EN (they also have a Spanish channel, the original, plus some other languages) https://youtube.com/c/VisualPolitikEN

[defrost]

Matt Parker's Stand Up Math is a gem:

https://www.youtube.com/user/standupmaths

[yeahwhatever10]

Gotta add Michael Sugrue to Philosophy: https://www.youtube.com/channel/UCFaYLR_1aryjfB7hLrKGRaQ

Brilliant lectures on Western Philosophy.

[bakuninsbart]

For Film Theory, I think Big Joel is a good if weird addition. I don't agree with him on everything, but he certainly has interesting and (usually) well-founded opinions. Most of the videos are on really niche topics that maybe apply more broadly to cultural trends.