If you’ve never read any of Mary Roach’s books, I highly recommend them. Her use of footnotes is excellent. (They might even be the best part of her books.)
Gulp is about eating and digestion. Her other books cover sex, death, and space travel, among other things. Roach has done a tonne of research and seems to revel in asking experts the way-out-there questions. She’s funny without sacrificing accuracy and scientific principles, and she has no qualms about grossing her readers out (lucky for me, as I like gross things and find them endlessly interesting).
As an aside — did you see this story from earlier in the week on a kid who had 232 teeth removed?! I was disappointed that there were no pics, but fortunately a kind person on twitter sent me a shot of the x-ray.
That aside is why blog posts need footnotes. Anyway, this was an A+ book and your kids (or inner kid) will probably appreciate all the poop jokes.