The fun part of writing a book is you get to put everything you have, into it. Also lots of things you had but no longer have, and things you always wanted.
I've always been a lover of science. If I hadn't been a writer/illustrator I might have been an embryologist. I was always fascinated by the development of the human body, and figured it'd be a neat thing to research for a living. But then I had four kids and just researched them, instead, and did writing and art for a living.
In writing the sequel to the Ellie McDoodle book, I get to revisit some weird science from my past, including Puff balls, and Touch-me-nots, and some strange insects demonstrating biodiversity.
I can't say more or you won't want to read the book.