I'm hoping to tap into the great sea of experience on this board. My DS6 consumes Magic Tree House books, sometimes in one sitting. I'm glad he enjoys them, but he's close to finishing the series and I think it's time for something slightly more difficult. What I really appreciate about Magic Tree House is that there are some great nonfiction facts thrown in and most importantly, it's not too mature or scary. I would prefer books whose characters are not in middle school and dealing with boy/girl issues. He read one of the "I survived" series on Hurricane Katrina, but now is anxious about a hurricane hitting our house :-/ Any suggestions?