Describes a sequence of activities which explore the nature of magnetism. Presents background information and details for classroom instruction for the following activities: plotting two-dimensional magnetic fields, making the reed switch and the reed relay, building a ribbon and moving coil loudspeaker, and investigations of a toy commutatorless…

A cheap and simple model that can be made and used by pupils to study the human breathing mechanism is presented. A list of needed materials, procedures for construction, possible refinements, and method of use are included. (KR)

A procedure that allows students to view an entire bacterial growth curve during a two- to three-hour student laboratory period is described. Observations of the lag phase, logarithmic phase, maximum stationary phase, and phase of decline are possible. A nonpathogenic, marine bacterium is used in the investigation. (KR)

Equipped with drinking straws and stirring straws, a teacher can help students understand how resistances in electric circuits combine in series and in parallel. Follow-up suggestions are provided. (ZWH)

Describes an activity for computing the volume of water in a blanket of snow, focusing on measuring and controlling variables, and then using critical thinking skills to analyze data. (HTH)

Biology and geometry students join forces to investigate a real world problem, recycling and landfill management. (ZWH)

Describes a four-phase chemistry activity designed to offer students an opportunity to gain and practice skills in research, written and verbal communication, database creation and use, and to work as part of a problem-solving team. (ZWH)

Describes an activity that allows students to discover the concept of density and that density is a determining physical property of a pure substance. Makes suggestions to further enhance students' understanding of density. (ZWH)

Describes an activity, bungee jumping, that is fun and effective in illustrating energy transformation. The activity incorporates biology, physics, and calculus into one unit. (ZWH)

Describes activities that allow students to work cooperatively to analyze and study evidence from crime scenes and archaeological digs. The activities demonstrate to students the interdependence of a variety of disciplines in the real world. (ZWH)

A variety of examples are given from different areas of biology to illustrate the general applicability of matrix algebra to discrete models. These models of biological systems are concerned with relations between processes occurring in discrete time intervals. Diffusion, ecosystems, and different types of cells are modeled. (KR/Author)

An exercise that uses a common bacterium, E. coli, in great numbers, to detect a demonstrable change in the ability of some cells to become resistant to the common antibiotic streptomycin is presented. The procedure for preparing and pouring the gradient antibiotic plates is provided. The advantages of using the Basic Fuchsin in the agar are…

Activity in which students act out process of protein synthesis is described. An overview of the events and a demonstration of some simple errors that may occur in the process are included. The simulation has been designed so that each student in a class has at least 1 specific role to play and requires from 20 to 40 students. (KR)

Suggested are activities about whales for children in schools not near the ocean. Activities designed to pique students' interest in whales and to investigate the size, breathing, buoyancy, and feeding strategies of whales are discussed. (CW)

Presented is a map of the night sky in the northern hemisphere during the month of March 1991. A calendar of celestial highlights including the positions of the planets and several stars is included. (CW)