Ask HN: Educational YouTube channels run by individual content creators?

I am looking for educational youtube channels which are run and managed by single creators. The format of the videos maybe anything ranging from MinutePhysics style pen and paper explanations with overhead camera or sophisticated animation vidoes like that of CGP Grey.

If you know even small channels that are run by singular creators that can be valued for the quality of their content please mention them.

Some exceptions may be made for teams of 2 to 3 people. I just don't want anything run by a giant company that has infinite resources to spend.

Any topic would suffice.