Using concrete examples, it is shown how the language laboratory can be used for preparation for and follow-up of discussions (e.g., of the British educational system). This is meant to be an alternative to the customary use of the lab for language drill. (Text is in German.) (IFS/WGA)

A planetarium, star projector, and projector stand all which can be built for $30 are pictured. Classroom activities involving the materials are described. (CP)

A five-week introductory unit on electricity, structured in a historical perspective provided by the letters of Ben Franklin, is described. (CP)

Describes an experimental procedure for the analysis of common cations in solution for an introductory analytical chemistry course. (SL)

Reports an experimental procedure for introductory chemistry courses to demonstrate a homogeneously catalyzed reaction. (SL)

Describes an undergraduate biochemical experiment involving the isolation and characterization of acid phosphatase from readily available materials. (Author/SL)

Media is used as a supplement in a science education program based on the inquiry method. Students work in small groups and rotate from station to station. (STS)

Actin and myosin have now been demonstrated to be important constituents of many eukaryotic cells. Their role is primarily that of a contractile system underlying all aspects of cellular motility. Described here is a simple experimental system to demonstrate quantitatively aspects of motility and its regulation in a slime mold. (Author/MA)

Describes a contract grading technique which includes assigned and optional laboratory work and the grades attached thereto. (SL)

Describes an undergraduate biological chemistry laboratory experiment which provides students with an example of pseudo-first-order kinetics with the cardiac glycoside inhibition of mammalism sodium and potassium transport. (SL)

Describes a photochemistry experiment involving the quenching of uranyl luminescence by alcohols. (SL)

Describes an experiment wherein simple gamma-ray detection and analysis techniques were utilized to study radioactivity in local precipitation. (Author/SL)

Discusses the need of introducing corrections due to wire stiffness arising from end constraints and wire axis distribution curvature in the measurement of ac electrical frequency by exciting transverse standing waves in a stretched steel wire. (SL)

Presents an apparatus for demonstrating two-dimensional random motion suitable for illustrating molecular phenomena. Three specific uses are presented. (SL)

Describes an experiment for estimating the half-life of thorium-232. (SL)