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So I'm back. I guess by your presence here you've shown that for you people, DP1 is well under control. And that's great. OK, so today is the last lecture on this topic on the networking piece of 6.033. And, the topic for today is something called congestion control. And what we're going to do is spend most of today talking about congestion control. But let me remind you of where we are in networking. And so if there's one thing you take away from 6.033 from this networking piece you should remember this picture. So the way we're dealing with networking, and the way we always deal with networking in any complicated system is to layer network protocols. And the particular learning model that we picked for 6.033 is a subset of what you'd see out in the real world. And it's mostly accurate. There is something called the link layer which deals with transmitting packets on the link. And of that, you have the network layer. And, the particular ki...

ADAM MARTIN: So I guess I will start by, first of all, congratulating you all. Since the last time I've seen you, you've all regenerated your intestine. So it's like you're a brand new person. So there's that. I want to start the lecture by talking about something I've been putting off telling you about, which is the Nobel Prize in physiology or medicine that was awarded this year. And it was awarded to James Allison and Tasuku Honjo for their discovery of a way to harness the immune system to fight cancer. And we're going to talk about the immune system later in the course, and it turns out, I will lecture on it. And I've actually had immunology, and in fact, I had immunology with James Allison. So I will do my best to channel James Allison when I talk about the immune system. But what they won the prize for is, they figured out a way to essentially release the brake on the immune system in order to allow the immune system to better fight ...