Describes a science activity which allows secondary level students to discover the law of refraction. (SL)

Reviews articles and papers published in 1975 relating to chemistry and presents a number of chemistry experiments, demonstrations,and activities. (SL)

Describes an experiment investigating the polarization characteristics of light scattered from a dielectric cylinder. (SL)

Analyzes the physical explanation accounting for tendency of Laboratory spring-mass oscillators to swing sideways. (SL)

Describes an experiment giving precise results of solubility as a thermodynamics property. (SL)

Describes an experiment studying the decay of moth balls to demonstrate diffusion phenomena. (SL)

Describes a freshman physics laboratory experiment for approximating the mean free path in high density gases by measuring the mean free path of hockey pucks on an air table. (SL)

Describes demonstrations, some apparently paradoxical, which can be performed with commercially available magnetic stirrers. (SL)

Presents a triple pendulum used to demonstrate normal modes. Also discusses the mathematical similarity of the equations of three coupled quantum mechanical levels. (SL)

Analyzes 46 medical research papers on the effects of innovative versus standard surgical procedures on the health of patients. Results reveal that innovations generally reduce complications. The ethics of experimental surgery are also discussed. (CP)

Analyzes the temporal features of the transient unconditioned stimulus preexposure effect observed by Cannon (EJ 123 672) and attempts to determine whether a preconditioned stimulus toxin presentation can both condition a backward taste aversion and interfere with the development of a forward aversion. (Author/RK)

Describes an inexpensive photo transistor timing system, apparatus for measuring muzzle velocity, and an apparatus for exposing modes of coupled oscillators. (SL)

Meyer, Schvaneveldt, and Ruddy report that semantic context has a larger effect on visually degraded words than on undegraded words. Degrading stimuli takes place by superimposing a dot pattern over letters thereby slowing information processing. Four experiments explore alternative explanations of this research finding. (Editor/RK)

Although the linguistic properties of sign languages, and of American Sign Language (ASL) in particular, are beginning to be studied, little work has been done on the functional properties of sign. Four experiments are reported in which signed messages were subjected to varying amounts of disruption using repetitive temporal interruption. Results…

These experiments consider similarities and differences between classifications of pictorial and verbal stimuli in order to investigate whether the kinds of information used differ depending on the stimulus class. Three hypotheses regarding the information used in picture and word classification were evaluated. (Author/RK)