This updated fourth edition of a popular reference for teachers, students, parents, and librarians is particularly helpful in finding activities useful in class demonstrations, science fairs, and lab projects. It is organized by subject area and project, and it lists science terms, principles, and experiments. There are over 7,000 entries in this new edition with over 300 new books indexed. Books can be located through both subject and author indexes. Previous editions have been well received and reviewed. Grades K-8.