We have loved this curriculum over the past year. The reading material is very engaging and imformative, sometmes to the point of overload. Overall, they have learned SOOO much though. The Try This activities are the weak point; they seem to need more research description. I often found it best to look up my own activities to demonstrate the concepts. This happened more than once per chapter, but he chapters are very activity heavy, which is great for making the science real to the kids.