Teachers TryScience

Teachers TryScience is a collaborative web site developed by the New York Hall of Science, IBM Corporation and teachengineering.org to bring best practices in design-based learning to schools in order to challenge students to engineer solutions through their knowledge of Science, Technology, Engineering an Math (STEM)

It provides elementary school students with a collection of free and engaging lessons and science activities. You can browse them by topic, by age and by estimated time required.

http://www.teacherstryscience.org/