I'll start with:
- Veritasium https://www.youtube.com/@veritasium
- 3Blue1Brown https://www.youtube.com/@3blue1brown
- Steve Mould https://www.youtube.com/@SteveMould
- braintruffle https://www.youtube.com/@braintruffle
- Sebastian Lague https://www.youtube.com/@SebastianLague
- PBS Space Time https://www.youtube.com/@pbsspacetime
- Machine Learning Street Talk https://www.youtube.com/@MachineLearningStreetTalk
I'll have to mention Igorrr because nobody did, which is strange.
Igorrr - Savage Sinusoid
https://www.youtube.com/watch?v=UBakgOHKI-g