True", everyone. JJ and I are here, and in this video, we're going to give a quick presentation of something I'm going to start doing right now and hopefully continue doing it constantly, at least once every week for the next few months. In relationship to sheets and Apps scripts, I know I haven't done a lot of videos in English recently, but the idea is to get back on the train here. We're going to start off with something with English - MAC addresses. But the idea is to give short videos that don't go beyond ten minutes, to give you guys some things that you can use to take better advantage of sheets in general. On the other side, to start taking advantage of small Apps scripts that can help you control things like users, classrooms, and assignments that you can do from a spreadsheet as well. So as to me, a lot of Spreadsheets going on here with some Apps Script, but we're going to start off with some simpler stuff, which is going to be the tricks that I've found that sometimes in Excel, you have to do certain things, and here we can do them very easily within sheets. So we're going to start off like I said before with the MAC address construction. A MAC address typically is something that each electronic device that we have, smartphones and laptops, and tablets have, that sometimes you need to get so that you can do Mac filtering, which is something that a lot of people who work with Wi-Fi need to do to set up. So this may not be interesting to you in itself, but it's going to be something there for anyone who works with Wi-Fi, it's going to be something useful, especially when...