Describes a demonstration to illustrate the importance of knowing what is supposed to be learned before studying begins. Suggests that the exercise may be used to show the basic elements of a scientific experiment. Explains that attention's effect upon memory is shown by students' tendency to remember best what they are told to remember. (DK)

An activity that uses dandelions to show the phenomenon of geotropism is described. The process of sedimentation, which causes the bending, is observed at moderate magnification under a standard microscope. A list of needed materials, directions for the tissue dissection, and time-lapse photographs of the process are included. (KR)

Described is a LOGO computer program that enables students to investigate the relationship between a digital number and the resistance in a variable resistor used to generate that number. Likewise, actual temperature readings and the corresponding resistance within a thermistor can be used for data gathering and subsequent analysis. (JJK)

A simple experimental arrangement that makes it possible to simultaneously observe and compare on a screen the two interference patterns produced by reflected and transmitted light from incident white light impinging on a soap film directly is described. Procedures and illustrated effects are discussed. (CW)

Two experiments which can be used to illustrate light diffraction using compact disks are detailed. Included are procedures, computations, and probable results. (CW)

Describes an experiment to induce carbon dioxide deficiency to demonstrate its effects on plant growth. Suggests further studies to examine respiration by soil microbes and the effects of relative humidity, other gases, and air pollution on plant growth. (MDH)

Provides instructions to construct a device that measures air pollutant concentrations using an inexpensive modified portable aerator. Describes sampling strategies by which students examine the concentrations of pollutants in school and industrial settings. (MDH)

Describes a hands-on simulation in which students determine the age of "fossil" pollen samples based on the pollen types present when examined microscopically. Provides instructions for the preparation of pollen slides. (MDH)

Describes a physics demonstration in which two-liter plastic bottles can be used to show how force relates to pressure and area. Identical drinking straws are launched out of similar plastic bottles with different-sized openings. This demonstration proves qualitatively that pressure is inversely proportional to the area exposed to an object when a…

Gives several sample experiment problems for electricity and magnetism. To solve an experiment problem, students have to do one or more of the following: clarify a poorly defined problem, divide a problem into parts, access the appropriate concept needed to solve each problem part, decide whether approximations are appropriate, design an…

Describes the development of an innovative, multimedia, interactive CD-ROM aimed at helping teachers tackle the problem that students have with evaluating science laboratory work. (Author/WRM)

Describes an experiment in which students determine the density of Coke and Diet Coke, consider density as an intensive property, and compare the accuracy and precision of different types of glassware. (WRM)

A biotechnologist-turned-teacher introduces a series of laboratory modules incorporating concepts from microbiology, cellular biology, molecular biology, biochemistry, and evolution. The Amylase Project aims to distill the biotechnology process into a few short steps using amylase, the easiest enzyme to detect of those commonly produced by…

Offers free software for timing experiments, instructions for making a timing interface and a variety of switch sensors for any IBM-compatible computer, and suggestions for experiments. (AIM)

Describes how computer simulations can enhance students' learning of physiology. Discusses how computer models enhance experimentation; using computer modeling in high school science; three steps in students' writing of a simulation; and the value of simulations. Lists six software vendors who offer packages on the PC or Macintosh platforms. (AEF)