Presents two experiments: the first one measures the heat of an exothermic reaction by the reduction of permanganate by the ferris ion; the second one measures the heat of an endothermic process, the mixing of ethanol and cyclohexane. Lists tables to aid in the use of the solution calorimeter. (MVL)

Describes a demonstration to show the character and behavior of mixing clouds. Discusses laminar and turbulent flow, and the formation of contrails and other cloud phenomena. (CW)

Described are five physics activities including two superconductor projects, synchronizing video camera movements, electrical analysis of a bicycle, and apparatus for the measurement of thermal conductivity. (YP)

Instructional engineering principles were applied to development of instruction in dental mirror skills, and the instruction was validated with 92 students and 25 controls. Measurement of skills over a period of a year and mirror usage during the practical exam indicated instructional effectiveness. Mirror skill instructional tasks are described.…

The first step in engineering the instruction of dental psychomotor skills, task analysis, is explained. A chart details the procedural, cognitive, desired-criteria, and desired-performance analysis of a single task, occlusal preparation for amalgam restoration with carious lesion. (MSE)

Comparison and analysis of the restorative treatment recommendations made by dentists and dental school students for 63 patients found about 85% agreement on treatment plans. It is observed that the results provide some basis on which to assess how well dental school treatments reflect mainstream practice. (MSE)

A survey gathered information on methods of class II amalgam preparation taught in 59 dental schools. Focus was on the teaching and testing of proximal retention groove use, stated rationale for placing retention grooves, and the relationship of the instruction to board criteria for cavity preparation. (MSE)

Contends that, by teaching economics as a laboratory science, using computers, students can be helped to think like economists. Describes computer laboratory exercises and a new economics curriculum being implemented at Denison University (Ohio). (DB)

Classroom demonstrations of selected mechanical properties of polymers are described that can be used to make quantitative measurements. Stiffness, strength, and extensibility are mechanical properties used to distinguish one polymer from another. (KR)

The use of an olfactory acid-base indicator in titrations for visually impaired students is discussed. Potential olfactory indicators include eugenol, thymol, vanillin, and thiophenol. Titrations performed with each indicator with eugenol proved to be successful. (KR)

Describes relatively simple and inexpensive experiments for demonstrating the immune response to honeybee venom in the American cockroach, "Periplaneta americana." (PR)

Provides instructions for teachers and students to culture protozoans for use in science laboratories. Sections include setting up a culture area, basic culture media, amoeba culture technique, powdered milk-wheat-rice medium, alfalfa medium, and uses of the protozoa in the laboratory. (PR)

Describes a technique to isolate unsheared bacterial DNA and subject it to restriction endonuclease enzyme digestion. (MDH)

Recommends the use of constructivist-based strategies to engage students who are not interested in science using traditional methods. Focuses on the application of these strategies in a laboratory experience exploring gas laws. (DDR)

Details a project in which students assess the health of two seemingly different streams by conducting chemical and biological tests. Focuses on student and teacher use of a watershed educational project in Tennessee. (DDR)