This would only be introductory videos for purposes of kicking off a topic - but have you seen the Physics Girl videos on youtube? (And related blog that could be a useful next step). Here is her latest on "What Are Quarks?":
Good/fun teaching that doesn't dumb things down.

I'm not a physicist, but I do have science training, and I haven't spotted any inaccuracies. Plus, I believe she has a degree in physics from MIT, so probably a decent source.

Sue