Over the last 10 years, i2 Learning has partnered with some of the leading STEM organizations in the world to develop project-based STEM curriculum for middle school students. Having been run successfully in schools around the world, the best of these lessons are now freely available for all. Each set of lessons comes with an educator guide, student pages, a materials list and training videos showing how the activities are done. Lessons are organized by topic area and are linked to NGSS standards.