Remember, this is an intro lecture. You're probably going to have to learn a little bit more by maybe, I don't know, reading a book or something. But we certainly hope that you have enough to make yourself comfortable in class, pass that test, and maybe your brain's a little bit bigger as well. So giddy up the learning one more time, guys. I say it at the end of every lecture because I mean it with all my heart. Where attention goes, energy flows. Make sure you check out the growing world playlist down in the description below.