Times up!
I'd imagine I can say this without worry about huwting your widdwe feewings...
I liked it a LOT. I like you voice, your expressiveness (is that a word?), that you don't sound like you're talking down to anyone, the information, the clips you used, everything BUT BUT BUT BUT you need to try to stop saying ummm and uh so much.
Watch one minute, any minute, and count how many times you do this. (I haven't and won't. I'm not judging you here. I'm only trying to help) and I think you'll see what I'm saying.
That aside, Mr. Eye Candy, it's really really good.