[MUSIC] So we're still on boundaries here. >> Okay. >> And Icelandic volcanoes and the best team ever- >> Yeah. >> Are how you describe inputs and outputs. >> Yeah, and so the last thing with the boundaries, right, is you define your systems, the spatial boundaries, the time boundaries, the level of detail. But then you're also going to have to consider things that are coming into and out of your system, right, inputs and outputs So the Icelandic volcano and the best team ever. So Barcelona's my favorite soccer team and frontrunner. >> [LAUGH] >> And they won the Champions League in 2000, I think it's 2009 and 2011 and then in between, I could be wrong, it could be 2011 and 2013, but whatever. They win it a lot. >> Yeah. [LAUGH] >> So the year that they didn't win it, they lost to Inter Milan. And one of the reasons, when they went to play against Inter Milan, they had to take a bus instead of their usual cush chartered flights. And the reason they had to take a bus is because all the flights in Europe were grounded because of this volcano in Iceland. >> Yeah. >> And so instead of getting rest and being well prepared for the game, they took the bus and that was the only game they lost. It's the only game they even really gave up any goals, and then they were just out of the championship. So that's kind of an input into the system was that volcano, right? And that's not something that can be ignored. And that also ties into the sustainability and climate change. Not saying that volcano is related to climate change, but one of the worries with climate change is kind of increasing frequency of these kind of extreme events. >> Yeah. >> Right, that are inputs into the system and can drastically change the performance. So I didn't have a separate sustainability example. I just said, this is something that is totally related to sustainability as well. >> Sustainability influence to soccer. [LAUGH] >> Yeah, those are the directive points there.