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)

The concept of community energy flow provides a basis for a field course. This paper describes the methodology used in a field course for estimating parameters and for monitoring physical environmental variables. The paper culminates in the construction of a model of energy flow through the community. (Author/MA)

Current debate has focused attention on the role of language in learning. This article describes how students' knowledge and interest in their own subject was used to start them thinking through ideas about language. The value of such an approach is discussed, and also the problems inherent in it. (Author/MA)

Reviews five of a series of 19 games from Longman Science Games Series, Longman, Australia. The games are appropriate for junior and senior high students. (CP)

Young children are more comfortable in the light because they can more easily recognize their surroundings. In this article there are activities for preschoolers that include controlling a light source, playing with prisms, and shadow play indoors and outdoors. Each activity is described in detail and needed materials are simple. (MA)

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)

An experiment on the heat conductivity of different materials are described. Applications for energy education in the elementary classroom are implied. (MDR)

Presents a method for demonstrating Seebeck, Peltier, and Thomson effects in a single experiment. (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)

Reports results of a survey of 592 secondary students of their like/dislike of science activities. Data for both boys and girls are reported. (SL)

Describes the calculation of the potential of the Earth's gravitational field strength and the energies of satellites in orbit round the Earth with a programmable pocket calculator. (SL)

Describes activities for secondary earth science and biology classes in collecting, preparing, mounting, and manipulating microfossils. (SL)

The authors give directions for comparing the rates of zero and first order chemical reactions to the rate of flowing water in simple physical systems. They also show how to compare chemical equilibrium to the level of water in a u-shaped tube. (AJ)