From Wednesday, September 18, through Friday, September 20, the Kindle version of Invent To Learn: Making, Tinkering, and Engineering in the Classroom will be FREE. (Start and end times are approximately midnight Pacific time.) A Kindle book will run on almost every device—iPad, Mac, Windows, Android, iPhone, and Kindle using the free Kindle app. Go to http://inventtolearn.com/free to receive your free eBook! Tell your colleagues and friends!