Screencast: What is yield and generators?

I made another little screencast about Koa Js. This time I talk about and shows the concept that Koa is built upon; generators. We're also visting the "yield" keyword in order to understand what's going on.

Yo,
I
Expect
Little
Delay
is my new way of explaining what happens when you say yield in your code. I hope you enjoy this.