Discussed are problems revealed in student responses to a practical task which formed part of an advanced level examination. The frequencies with which some misconceptions about cell reproduction and genetics occurred are presented. The nature of these misconceptions is analyzed and their implications discussed. (CW)

Presented is an approach to solving oxidation-reduction reactions. The advantage of this procedure for both acidic and basic equations is stressed and emphasizes the electrical nature of redox equations. (KR)

Discusses the use of systematic networks as a basis for the construction of a questionnaire on teachers' views of the philosophy of science. Describes issues of the scientific method, criteria of demarcation, patterns of scientific change, and the status of scientific knowledge from four philosophical positions. (Author/YP)

Investigated were the connotative meanings of the concept "development" in respondents' cognitive structure using a free-association approach. The sample included 6th, 9th, and 11th grade students, student-teachers, and biology teachers. Reports a paucity of multicontextuality; the majority of subjects' associations referred to biology…

Examines anxiety levels about teaching and achievement before and after an earth science course. The State-Trait Anxiety Inventory was used to measure anxiety. Reports that initial anxiety levels were changed in a positive direction and significant gains were made in achievement of concepts. (YP)

Describes the discovery and characteristics of superconductors. Discusses some experiments on the levitation of a magnet over a superconductor. (YP)

Explores the power transfer using (1) a simple electric circuit consisting of a power source with internal resistance; (2) two different mechanical systems (gravity driven and constant force driven); (3) ecological examples; and (4) a linear motor. (YP)

Reports various misconceptions of Newton's third law obtained from interviews and written tests of high school students. Suggests putting emphasis on the third law in physics teaching. Ten references are listed. (YP)

Describes experimental procedures to produce magnetic fields with a thermocouple. Provides diagrams showing the apparatus, tables of experiment data, and background information on the theory. (YP)

Describes three experiments with an air table to produce a centripetal force. Provides some diagrams and pictures of the apparatus. (YP)

Discusses the general construction of an air track. Describes three demonstrations including elastic collision, forced oscillators, and coupled oscillators. Provides a diagram and four pictures. Suggests how a similar exhibit could be constructed with a modest budget. (YP)

Answers the question about the crown effect of a liquid drop. Describes the concepts of surface tension, irregularities, and pinch effect. (YP)

Describes the problem-solving behaviors of experts and novices engaged in solving seven chemical equilibrium problems. Lists 27 behavioral tendencies of successful and unsuccessful problem solvers. Discusses several implications for a problem solving theory, think-aloud techniques, adequacy of the chemistry domain, and chemistry instruction.…

Presents a mechanics problem illustrating that Newton's second law and the linear conservation of momentum principle must be used in an inertial reference frame. Provides an analysis of the problem. (YP)

Presents a lesson in the mechanics of rotation which deals with setting the playground swing into motion. Discusses the scientific principles involved in these procedures. Illustrations of several explanations are included. (RT)