Reported here are brief descriptions of a common grading and scaling formula for large multi-section courses, an ion exchange amino acid separation and thin layer chromatography identification experiment, a conservation of energy demonstration, a catalyst for synthesizing esters from fatty aids, and an inexpensive method for preparing platinum…

The evidence for the effectiveness of the first letter mnemonic technique is confused. There are at least three studies showing no effect, and one where an improvement in recall occurred. Reports two experiments which attempted to locate the conditions under which the first letter mnemonic is effective. (Author/RK)

Attempts to help specify the boundary conditions for use of the recognition-recall method, i.e., recall made conditional upon recognition, and to use this method to evaluate a hypothesis about stimulus-concreteness effects with low-meaningful responses. (Author/RK)

Derives the precessional period of a Foucault pendulum without using small oscillation amplitudes. Shows that if the path of the pendulum passes through the origin, the periods for differing amplitudes are essentially the same. (GA)

The construction of an operational amplifier for use in a chemical instrumentation course is described. (CP)

Describes four demonstrations of the Leidenfrost phenomenon; floating of liquid drops on their own vapor above a hot surface, delayed quenching of red-hot brass by water, explosion of vessels containing suspended liquid droplets, and momentary incombustibility of living tissue immersed in boiling oil. (Author/GA)

Describes an apparatus for investigating the behavior of photoelectrons in a uniform magnetic field in either a vacuum or a low-pressure gas. Presents data and discusses some basic features of the photoelectric effect and the diffusion of free electrons in a gas. (GA)

A quantitative model is presented for understanding self-control and impulsiveness involving aversive events. Four experiments were conducted to test the model's adequacy in predicting how delay until punishment and duration of punishment affect choice. (Editor)

Uses a Group Embedded Figures Test (GEFT) as an indicator of field-independency in an investigation with college graduate students. Results reveal that GEFT scores were not affected by the treatment of 18 hours of instruction in Science Curriculum Improvement Study (SCIS) materials or by pretesting effects. (CP)

Exercises for introductory to intermediate level college students are proposed. Observations of pulsars can be used to illustrate the phenomena of dispersion and Faraday rotation of radio waves, and to illustrate the differential rotation of the galaxy. (BB)

Examines American and British policies concerning DNA research and gene transplantation. (CP)

College-level chemistry questions and satisfactory answers are provided. (CP)

Detailed instructions for use in an undergraduate level course are provided. (CP)

Presents the results of two experiments concerning the phenomena of the interference of probabilities and of the so called Aharonov-Bohm effect. An electron biprism and a standard electron microscope have been used for the experiments. (Author/GA)

Describes the use of programmable calculators to perform classroom controlled experiments on economic models. The complete program for exploring the dynamics of the Harrod-Domar equation is given. Some difficulties encountered and statistical uses are mentioned. (BC)