Origin of the word "Christmas"

This woman has so much to teach the world. Truly a great educator.

But seriously folks, how American is this? A Russian philologist (her website says she has two degrees in philology, so who am I to argue?) with a penchant for silicone (I'm only speculating here) and a sense of humor comes to the land of capitalism and makes a killing teaching what I assume is a mostly male audience the origin of English words.

You have to love this country. God bless us, everyone.