Introduces the pea plant experiment targeted to determine the effects of Knop's solution, a solution containing all the necessary minerals, on plant growth. Compares two groups of pea plants, one treated with Knop's solution and one treated with demineralized water. (YDS)

Presents a simple, practical, and inexpensive method for growing microorganisms that will help middle school students experience microorganisms and introduce them to important science concepts. Students grow microorganisms and investigate questions concerning environmental factors that affect growth of populations. (LZ)

Six major concepts of science are illustrated through the use of simple, easily equipped hands-on activities. Included in each activity are a list of materials, procedures, questions for students, and suggested discussion. Aquatic acoustics are highlighted. (CW)

Teaching creative thinking can be accomplished by activities in which the teacher asks questions of the students which require divergent thinking. The activities in this article do not require equipment, supplies or manipulatives. They consist of questions, possible student answers, and suggestions for follow-up. (CW)

Discussed are the advantages and processes of making collections with children. An activity for making a classroom collection (herbarium folios) is described and includes materials and procedures. The processes of collecting and classifying are stressed. (CW)

Described are several activities for teaching children to determine mass and volume. Included are the masses of a water drop and a grain of rice; the volume of a water drop and small solids; and measuring the width of a hair. Procedures and materials for the activities are discussed. (CW)