 I know we have some time, but since you are here, I think it's okay if you can listen to me. So just to show off, how many of you are already coding with React or going to evaluate it right away? One, two, that's it. What are the frameworks to use? I know we are in a jQuery conflict. That's okay, but how many of you use backbone here? Angular? Ember? Only two? Any other frameworks? Just shout it out if. Ah, okay. Yeah, yeah. Yeah, true. How many of you are coding other than JavaScript here? Java, I suppose? Or which other language? Ruby, Python. Python, okay. How many of you are in Ruby? One, oh, two, okay. Closure, anybody? Wow, okay, there's only one. Okay, we've got to fix this. Cool, I'm just filling time. You can ask me anything. By the way, do you know some crazy fun facts about JavaScript? Do you know undefined is not a keyword in JavaScript? You can actually do var undefined is 20. How many of you know that? You knew that already? Cool, okay. Yeah, I know, but that's no fun, actually. And you know, there's another thing where, actually, NaN is never equal to anything. I mean, NaN is not even equal to NaN. That's weird, actually. Yeah, but then you have a value. NaN is like a value, and you expect some value to be equal to some other value. Or at least to itself. What is type of undefined in JavaScript? Type of undefined is undefined? Yes. Type of undefined, type of null is object. See, I can't even keep up. But what would you have if null instance of object? What would that evaluate? Null instance of object?