 What is it that you've read or heard or studied that has led you to that conclusion? And you'll either get some more information, and that means you've probably got more of a leg up into the conversation, or actually your friend might simply say, well, everybody knows, which is shorthand for I heard Richard Dawkins say on Twitter this morning, and I don't know what's going on. And again, we're not trying to gotcha our friends, but we're trying to get beyond soundbites. So the why question is, yeah, you look for an assertion your friend has made.