I have a younger sibling who watches YouTube all day, and I have just installed (among other things, including Fedora KDE!) FreeTube on their laptop, and it has a convenient profiles feature to separate, for instance, educational and not so educational content.

What are some good sciencey channels that are easy to follow and are run be nice people (rather than bots or similar)? I’ve got SciShow, Clint’s Reptiles, and a few others already, but what are some good ones that you all know? They are currently interested in animals, particularly sea creatures and reptiles, but other topics are fun too (history, chemistry, CS, whatever are all good!)