This post should appeal to middle school educators that teach science. NASA has a new web-based, interactive, problem-based learning environment where your students can begin designing the air transportation system of tomorrow. Pupils will learn about forces of flight as well as the engineering of air transportation. Learners can also read online biographies focusing on careers in aeronautics and aerospace engineering. As a bonus to teachers, you'll find two educator guides that are available for download. the guides include a student log to help guide them through the activities. Did I mention that it's free?