[ Jim waits quietly as Xichen drinks the milk. He knows it'll work, but how fast and how well really depends on how much spicy food he's had. He may yet want to drink that whole glass, though, so don't knock it. ]

Oh, years ago, when I was a kid. It's just one of those things you're told helps, but you don't really understand why until you're older or look around for the explanation.

[ Speaking of! Jim sits down too, so he can try to explain it to Xichen, and why it's not actually magic. ]

Have I told you what molecules are?