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r/AskScience, r/AskAnthropology, r/TrueFilm, r/DepthHub and r/TrueReddit are those that come to mind. None of these are some perfect, but neither is HN and IMO you find a lot of great content there that you wouldn't find here.

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r/Linux and r/Technology are also good ones for those interested in CS and tech stuff.

The top post in /r/linux right now is a link to imgur that is a screen cap of an Amazon question:

Q: Does this keyboard support Linux?

A: The keyboard is advanced but you can not run Linux on the keyboard.

This is probably not what most people think of when they are looking for serious and in-depth Linux discussions.

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