I have a problem with the books stating "Pluto is not a planet" as a fact rather than as one point of view in an ongoing controversy. It is a disservice to teach only this view when it is still heavily contested among professional astronomers. It would be great to have a kids' book that presented both sides and then asked them to draw their own conclusions and keep following the latest updates. I'm also disappointed that I can't find any books for my four-year-old nephew that include Eris in the list of planets. Every time we look at books on the solar system (he can't read yet, so it's mostly just pictures), I have to explain that Eris was just found and hasn't made it into the books yet.