What Happens to a Hamburger? (Let's Read-And-Find-Out Science) - Paul Showers
Another winner from this series - Let's-Read-And-Find-Out-Science. Sometimes the Stage 1 titles can be a bit too simple, but I find that the Stage 2 books are just about right - informative, but still simple and engaging. And this book talks about poop - which is always a good thing in my book!