A brief history of the English Language, according to a Professor-lecturer

I would like to watch and enjoy this professor and his lecture about the history -briefly speaking- of the English Language. It's worth listening and watching.

Part One



 I can't get the full source for everyone to watch it, but you can get the video at youtube, here are the other links for other parts of this lecture:



Part II


Part III


Part IV


Enjoy it!