this is an engaging book. Great informative concepts presented in an intelligent, thought provoking way.The experiments ware fun and useful. Easy to implement; great springboard for stirring up even more interest. I would not hesitate to use with 3-6 graders. However, if I was teaching the younger set with no older kids in the mix, I would choose one of the other Exploring Creation books. This book held my kids' interests and inspired them to read more about the topics.