In a different field, we mentioned this before, but you're the author of read that, a traveller's introduction to chinese characters. In the preface, you explain that you were inspired by jerry to write the book after returning from a trip to china. So tell us about that, the experience of writing this book. This is a technical field in a way, but quite different from the ones we've been discussing. It simply teaching. Yes, the one and only book i personally wrote myself, from scratch. And i guarantee you that it does not assume anything. It tells you anything you need to know.