This widely acclaimed series by Janice Van Cleave has won praise from homeschoolers and the public school realm alike! Perhaps that's because they're so well laid out! Each experiment contains an explanation of the purpose, materials needed (usually common or readily obtainable), step-by-step instructions in simple language, expected results, and understandable explanations. Line drawings help illustrate set-up. Our children take turns selecting, reading about, constructing, performing, and explaining these experiments - usually without any help from Mom. With 101 experiments in each book (except for Energy and Engineering, which have 25), we've learned a wide range of concepts and principles - not to mention the additional learning which goes on while the kids spend time reading through them in order to select just the "right" one to demonstrate!