Describes an activity used at the Washington Park Arboretum that helps students understand cloning through plant propagation. Students also learn how to make a pot from recycled newspapers and how to make soil that is appropriate for the plants. (DDR)

Describes an experiment designed to measure absolute zero using Charles' Law without the use of mercury. Provides the procedure and details of the apparatus and includes experimental results obtained using the apparatus. (DDR)

Describes two variations of an air sampler and analyzer that are inexpensive to construct, easy to operate, and designed to be used in an educational program. Variations use vacuum cleaners and aquarium pumps, and white facial tissues serve as filters. Samples of air pollution obtained by this method may be used from early grade school to advanced…

Some of the important modern developments of thin-layer chromatography are introduced. Discussed are the theory and instrumentation of thin-layer chromatography including multidimensional and multimodal techniques. Lists 53 references. (CW)

Described is an experiment which illustrates pseudo-first-order kinetics in the fading of a common indicator in an alkaline solution. Included are background information, details of materials used, laboratory procedures, and sample results. (CW)

Describes some experiments for investigating the speed of atomic gas beams and displaying their atomic character. Discusses the experimental apparatus and the time-of-flight method. (YP)

Describes applications of bar coding technology that will help teachers to organize and energize their classrooms. Explains how bar codes--the black-and-white lines used for identification--are read and produced. Educational applications include their use in testing, equipment inventory, specimen identification, time keeping in experiments,…

Points out that the standard bell-jar model used to illustrate breathing has some features that may lead to a misunderstanding of the mechanism of ventilation. Proposes modifications to the model. (DDR)

Presents a relatively short, simple, safe, and visual method for student preparation of chlorine, bromine, and iodine using reactants and glassware that are easy to obtain and handle. (WRM)

Describes how scientists use representations and tools in the chemistry laboratory. Derives implications from these findings for the design of educational environments. (Author/CCM)

Describes equipment used for a magnetic force experiment that is capable of producing precise results but rugged enough to withstand handling by several hundred undergraduate students per year. (WRM)

Reviews the interests and inventions of Robert Bunsen. Describes the constant water level bath, suction pump, absorptiometer, and diffusiometer. Contains 16 references. (DDR)

Describes an hour-long activity to illustrate the properties and use of cylindrical concave mirrors. Appropriate for non-science majors or high school students. (WRM)

Describes the study of dung-inhabiting or coprophilous fungi to illustrate basic lab techniques and fundamental ecological concepts. Contains 24 references. (WRM)

Inquiry labs in the science classroom help students make connections and discover scientific relationships for themselves. This article describes an inquiry laboratory in which students explore the properties of a pendulum. Since most students are familiar with pendulums before they get to high school, they have discovered that the period is…