A salt model was developed as a teaching tool to demonstrate the development of caverns and karst topography. Salt slabs are placed in a watertight box to represent fractured limestone. Erosion resulting from water flow can be photographed in time-lapse sequence or demonstrated in the laboratory. (Author/CP)

Using the basic Bagnold design, a relatively inexpensive suction-type wind tunnel can be constructed for laboratory demonstration of sand-grain movement, ripple development, and other eolian processes. Its simple design provides no workshop problems and it can be made for a total cost in materials of approximately $225. (Author/CP)

Describes the experimental procedure used in determining the lifetime of tantalum-181. (CP)

Presents an undergraduate laboratory exercise in elementary statistics in which students verify empirically the various aspects of the Gaussian distribution. Sampling techniques and other commonly used statistical procedures are introduced. (CP)

A discussion is presented on the role of secondary teachers in public schools, followed by a sequence for teaching oxidation-reduction in secondary school chemistry courses. (BB)

Discusses recent advances in polarization techniques, specifically those dealing with polarization of atomic nuclei, and how polarized beams and targets are produced. These techniques have greatly increased the scope of possible studies, and provided the tools for testing fundamental symmetries and the spin dependence of nuclear forces. (GA)

Eleven papers are reported on which discuss teaching techniques related to the teaching of chemistry of the high school and college levels. (BB)

The article describes and evaluates the second-year experience of a programatically organized living-learning center at the University of Vermont. It compares student perceptions of the living-learning center and of more conventional residence halls, and offers explanations for the differences noted. (Author)

Discusses the place of the language laboratory in the audiolingual, situational, cognitive, and pragmalinguistic approaches to foreign language teaching. Finds that laboratory work can help in achieving some of the goals of "communicative competence," and suggests some criteria for judging such work. (IFS/WGA)

Describes how Nassau Community College uses peer tutors to help students with severe writing problems. (DD)

Discusses teacher liability in the science laboratory. Cites specific court cases to illustrate points. (MA)

Describes some undergraduate laboratory experiments on thermoanalytical techniques which deal with both organic and inorganic compounds. (GA)

Describes a modified experiment to measure the internal resistance of an energy source, where a small resistance is connected in series with the source. (GA)