This is the third book in the Frank Einstein series. All of your favorite characters return, but you don't really have to have read the first two books in order to get up to speed. Frank Einstein is a boy genius inventor, with a human pal, two robot sidekicks, and an evil, (actually mostly just sneaky and mean), boy inventor nemesis.
It's humor, action, science, science-fiction, and slapstick, all rolled into one. This time around Frank is trying to help his gal pal, Janegoodall, juice her fastball in order to get ready for baseball try-outs. So, we learn about the human body, including muscles, blood circulation, respiration, and the five senses. All of that comes into play as Frank noodles different ways to improve Janegoodall's performance, so the science and the antics all blend together nicely.
When you combine a fine hero, an amusing sidekick, two funny robot sidekicks, a kid villain, and a chimp villain sidekick, you really have a successful recipe. The humor is aimed high and low. There is slapstick and some kid friendly gross stuff. But on the other hand, there are some more sophisticated bits involving puns and sly cultural references. It's always a good sign when there's a little bit of everything for a wide range of young readers,and it seems to me that Scieszka is especially adept at writing middle grade books with wide appeal.
So, a nice find, especially for young readers with a scientific bent, and just plain good fun.
(Please note that I found this book while browsing the local library's books. I have no connection at all to either the author or the publisher of this book.)