Describes a technique for imparting essentially the same speed, in opposite directions, to two gliders to demonstrate that total momentum of equal masses traveling at the same speed in opposite directions is zero. Also describes a technique using a compression spring and beeswax for momentarily holding two gliders together prior to starting them…

Described is the Inquiry Role Approach, a teaching methodology for secondary school biology, developed by staff at the Mid-continent Regional Educational Laboratory in Kansas City, Missouri. The materials are designed to complement, not to supplement or substitute for, the biology textbook. (PEB)

Summarizes the results of three studies designed to determine whether Israeli middle and secondary school students have a stronger preference for the study of animals or of plants. (JR)

Examines the hydrologic cycle, the overall flow of water in the geosystem. Reviews the basic phase relationships among water, ice, and water vapor which are integrat parts of the hydrologic cycle. (JR)

Reports the results of an investigation in which the attitudes of Israeli high school students to physics were studied in an attempt to identify variables that may account for the low enrollment in this subject. (JR)

Suggests that technology education is an essential component of future science curricula for non-science secondary students. Explores some of the important issues and problems, and suggests directives for action, in moving toward technology education in the high schools. (JR)

Addresses the current issue of confusion surrounding the widespread use of the term inquiry. Attempts a resolution of the confusion by presenting a model of the processes of scientific inquiry, and proposes that the model's applications can be fruitful for teaching by inquiry. (Editor/JR)

Lists some of the disadvantages associated with the didactic method of teaching science and suggests ways in which teachers can improve this method and stimulate student interest. (JR)

Clarifies the difference between the Piagetian Conservation of Liquid Quantity task and the Conservation of Volume task and provides an alternative test for the presence of formal operational thought. (JR)

Reports the results of an analysis of IEA survey data relating to the variability in science achievement of 14-year-old students in Australian schools. The analysis indicates that the home background of students is the predominant factor affecting school science achievement. (JR)

Describes a packaging format for the intershelving of book and non-book materials and outlines procedures for preparing audiovisual materials for student use. (GS)

Explores the wave-particle nature of light by raising and answering the following question: "Can particle theory satisfactorily explain the experimental facts for light refraction?" (GS)

Indicates that in explaining redox reactions the definition of oxidation and reduction should be in terms of oxidation number, not electron transfer. Presents reasons and examples for this approach. (GS)