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Video 6. Yang-Mills 1 by David Metzler (2011) Source.
A bit disappointing, too high level, with very few nuggests that are not Googleable withing 5 minutes.
Video 7. Millennium Prize Problem: Yang Mills Theory by David Gross (2018) Source. 2 hour talk at the Kavli Institute for Theoretical Physics. Too mathematical, 2021 Ciro can't make much out of it.
Video 8. Lorenzo Sadun on the "Yang-Mills and Mass Gap" Millennium problem Source. Unknown year. He almost gets there, he's good. Just needed to be a little bit deeper.