[Lord. What is the least stupid way she can explain this . . . At least walking gives her a moment to think.]

It's genetic. [Technicallyish.] First properly documented in my teens. Well, I say properly documented, but I don't have the documents here. [Because they are still at her grandfather's house in Elsewhere, and they're less documents and more an autobiography, but.] It doesn't turn off, as far as I can tell. It just is.