>> [NOISE] >> Hello, everybody! Chuck, here. At another of the Coursera Internet History, Technology, and Security office hours. [NOISE] We are here in Puebla, Mexico. And I'd like you to meet some of your fellow students in the class. So you can say your name, as much as you want. Say hi to the rest of the students. >> Hi! My name is Alejandro. And I am from [UNKNOWN], Mexico. >> Okay. >> Hi. My name is Ursula, and I am from Mexico City. >> So, Ursula. Show us your certificate. Tell us a. >> This is. >> [NOISE] >> Is my certificate. I took the course last, the first course. And I am very proud, because you signed it. >> Let's take a look at the signature. There we go. Signed. So so there you have it. Here we are in Puebla Puebla, Mexico. Tomorrow night, I think we're going to be in Mexico City.