Describes an air track experiment which involves a massive particle incident on a fixed wall with a light particle trapped in between. An analysis for this experiment, which is intended for junior and senior college students, is also included. (HM)

Considers carbon-carbon multiple bonds in terms of Pauling's bent bond model, which allows direct calculation of double and triple bonds from the length of a CC single bond. Lengths of these multiple bonds are estimated from direct measurements on "bent-bond" models constructed of plastic tubing and standard kits. (CS)

Provides procedures appropriate for a high school chemistry class that demonstrate the Arrhenius law by determining the heat of vaporization of a volatile liquid. (CS)

Instructions are given for care of the giant hissing cockroach, "Gromphadorhina portentosa" from Malagasy. Reproductive behavior is described, as well as development of the young roaches. (SA)

Described is a gel diffusion experiment that permits the completion of duplicate diffusion runs within a three-hour laboratory session. Information included for the short-duration gel diffusion experiment is the diffusion cell, the experiment, data treatment, and the expected results of the experiment. (Author/DS)

Discusses the performance of a sprinting swimmer in biomechanical terms, and presents a theoretical model to evaluate the mechanical work and power of a swimmer. (SK)

Described is a game for field studies titled "Idols." Idols is a struggle of intellect and reason against instinct and superstition. The game involves two "tribes" which are protecting a superstitious legacy while trying to replace it with other forms of wealth and understanding. (Author/DS)

Describes a microbiology unit developed for an introductory college biology course in which the identity of an unknown bacterium is determined. Also described is an interactive taxonomy computer program which aids in the identity of the unknown organism. (CS)

Discusses methods for determining the population size of pond phytoplankton, including water sampling techniques, laboratory analysis of samples, and additional studies worthy of investigation in class or as individual projects. (CS)

Describes methods for studying heart primordia of the chick embryo, using the organ culture method. (CS)

Describes three fantasy trips for use in science classrooms. Includes suggestions for follow-up activities and alternate uses of fantasy trips. (DS)

Lists equipment and materials needed and procedures for analyzing soil, in which secondary school students experience practical applications to acid-base reactions, pH, oxidation-reduction, precipitation and solubility. (CS)

Described is a school project to investigate aggregations in flatworms which may be influenced by light intensity, temperature, and some form of chemical stimulus released by already aggregating flatworms. Such investigations could be adopted to suit many educational levels of science laboratory activities. (DS)

Two implanted slide techniques are described by which activity of proteolylic bacteria and the growth of algae in the soil can be readily studied by school students using simple apparatus and methods. Variations are suggested for studying the effects of agricultural practices and environmental conditions on the soil bacteria and algae. (Author/DS)

Discusses housing facilities for living animals in the classroom or laboratory. The construction of animal cages from materials obtained locally is described. Space recommendations for laboratory animals and cages are also included. (HM)