[Simons Institute] https://www.youtube.com/c/SimonsInstituteTOC - my favorite source for current research on theoretical CS, AI, computational sciences.

[MITCBMM - Center for Minds, Brains and Machines] https://www.youtube.com/c/MITCBMM - great lecture source for AI, cognitive science, neuroscience.

[Steve Brunton] https://www.youtube.com/c/Eigensteve - great lecturer on applied math for engineering and computation science. Like an advanced Khan academy

[The Royal Institution] https://www.youtube.com/c/TheRoyalInstitution - science talks for lay audiences, like Ted Talks but more advanced.

[Mathologer] https://www.youtube.com/c/Mathologer - misc math topics, like 3blue1brown. This guy is quirky and funny and good at explaining some advanced math topics.

[Numberphile] https://www.youtube.com/c/numberphile - topics on mostly math, but also CS adjacent.