/r/WatchandLearn: Watch and Learn - Gifs, videos, etc. that teach you something. - January 26, 2021 - 19:19
/r/satisfying: There's nothing odd about it. - Great videos, gifs, sounds, that just give that... *ahhhh*. - January 25, 2021 - 19:45
/r/EngineeringPorn: Engineering Porn - January 25, 2021 - 19:32