Know any hidden gems on Youtube, that educate & entertain?

Just curious to know what are some under rated youtube channels out there with quality and engaging content. It could be related to space, science, CS, or maybe misc (but in terms of productvity/learning). It serves as both, kill the time, and learn few cents, even if we're paying just mere attention while having lunch or maybe in metro etc.

I'm talking about under rated ones, so this does not include Veritasium, Real Engineering, 3Blue1Brown, Computerphile, or Kurzgesagt – In a Nutshell.

For me these list are as follows: a. Welch Labs: Covers mostly maths, science and in general AI related learning models.

b. Think Twice: Maths again, but with better visuals.

c. Oleksandr Stepanenko: I just love this channel to see crispy robots with sounds of their movements.

d. BPS.space: I love his RnD about rockets, their soft landing and failures. I never get bored while binging this.

e. Jamila Musayeva: Etiquettes n stuffs, satan have to learn these things to offend others professionally. STANDARDS

f. Ben Eater: Computer hardware in action, with scratch.

g. Looking Glass Universe: Quantum mechanic stuffs, in the same line as Veritasium.