"One announcement. There will be Quiz 9, the weekly quiz tomorrow based on the content of Homework 9 which is, I don't remember what it is, but you know what it is. I made it up, but I am already thinking about the next glorious event.

Now I remember. There is chemical kinetics and glasses. That's right, chemical kinetics and amorphous solids. That's right. Last day we started talking about diffusion which is solid state mass transport by random atomic motion.

And we were drawn to the paper that is up on the display which was published in 1855 by Adolf Fick which gave us the law that bears his name describing how matter diffuses through matter. Fick was a very talented individual, and I want to draw attention to something else..."