The Dangerous Book for Boys by Hal and Gonn Iggulden is a must in any boys library. We were the lucky recipients of this book last Christmas. The recommended age for the book is 10 and for a boy to do these projects on their own, I must agree. But my boys are a little younger and are totally enthralled just looking at the pictures, asking questions and begging me and my husband to help them do the projects. Projects include: invisible ink, building a tree house, making crystals, paper airplanes, smoke signals, famous battles in history, and secret codes just to name a few. This book is great for summer projects or a rainy saturday. I hope you will enjoy this book as much as our family has.