Mounting research evidence has shown that an activity centered approach to elementary and middle school science education can be quite effective. This sourcebook, developed for teachers by teachers, presents many activity oriented science lessons that could be done in any elementary or middle school classroom with minimal additional experience. Nearly all lessons use materials that could easily be found around most schools or homes or that could be purchased inexpensively from local sources. Each activity contains the focus of the activity, a challenge posed to the students, materials, procedures, further challenges and references. Topics include: teaching physical science activities; sound; light and color; electricity from static to circuits; electricity from magnetism to generators; forces and motion; simple machines; heat; forces in liquids and gases; matter; chemistry; and space. Numerous line drawings illustrate the activities. (CW)