Reports a study made to determine the perceptions of secondary science teachers with respect to their preferences for classroom instructional approaches and management strategies. (SL)

Discusses Piagetian concepts of cognitive development and the student's ability to understand chemical concepts at the secondary level. (SL)

The three possible fates of burned-out stars: white dwarfs, neutron stars and black holes, are described in elementary terms. Characteristics of these celestial bodies, as provided by Einstein's work, are described. (CP)

Discusses ability grouping and success in a secondary level chemistry program. (SL)

Provides supplementary notes on acids and bases suitable for secondary school chemistry instruction, including acidity in solid and natural waters, acidity balance in body chemistry, acid and basic foods, pH values of common fluids, examples of drugs, and commercial preparation of nitric acid. (SL)

Describes physics laboratory apparatus including devices to demonstrate projectile motion, glass cutting, and a pendulum clamp. (SL)

Reviews the trends of science choices among secondary level students in Britain, and summarizes research on factors associated with subject choice. (SL)

Describes errors occurring in a textbook presentation of electrical resistance across carbon arcs and filaments. (SL)

Two groups of high school junior chemistry students studied a science unit either at their own pace using programed instruction materials (treatment), or in a teacher-paced, lecture section (control). Test results showed that the treatment group performed significantly better. (MLH)

Students were classified as formal or concrete-operational using a battery of Piagetian tasks, a biology content examination, and a nonscience content examination. Based on the results it was concluded that Piagetian tasks are relatively content-free and can serve as realistic indicators of concrete and formal thinking abilities. (MLH)

Sixth-grade students received both structured and unstructured instruction on a physical science activity. Using test results, an analysis by treatment alone indicated that subjects achieved higher scores when taught in the structured mode. However, significant interactions of variables (type of activity and teacher) were also found. (MLH)

High school students were administered attitude tests with variations in wording (strong or mild) and stance (positive or negative). Resultant data showed that the positive versus negative item structure influenced student responses more than mild versus strong wording. (MLH)

Discusses the physics of the human ear and hearing. (SL)

Describes a physics experiment for demonstrating magnetic lines of force. (SL)

Describes air observation activity in which human fingerprints are investigated. Includes diagrams of various fingerprint types and the characteristics of various fingerprint ridge types. (SL)