Describes an activity that challenges students to apply their knowledge of motion to designing and constructing roller coasters. Emphasizes the processes students go through to communicate their ideas and the problem-solving skills they develop. (JRH)

Explains why performance tasks should be used for assessment in hands-on science programs. Lists guidelines to help teachers construct valid tasks for student or program evaluation. Illustrates the guidelines by discussing a chromatography task from the Second International Science Study test. (PR)

Presents a global warming activity and extensions that direct students in visualizing changes that may occur as a result of the predicted sea-level rise. Includes a map of site-specific U.S. sea-level changes. (MCO)

Describes an electronic circuit that can function as a prototype for chaotic systems. Specific applied voltages produce chaotic signals that can be viewed with an oscilloscope or be made audible with a home stereo system. Provides directions for assembly with typical costs, mathematical basis of chaos theory, and experimental extensions. (JJK)

Reports a study analyzing the inquiry level of science activities within junior high science textbooks and their accompanying supplemental activity guides. (PR)

Describes an exploratory study to identify determinants of elementary student's intentions to perform laboratory and nonlaboratory science activities. Fishbein and Ajzen's theory of reasoned action was used as the basis for the study. (PR)

Describes demonstrations to (1) construct an inexpensive static electricity detector; (2) obtain an abundant supply of either negative or positive charge using household items; and (3) create static electricity using a Tesla coil or Van de Graaff generator. (MDH)

Presents a series of activities that utilizes a leveling device to classify constant and accelerated motion. Applies this classification system to uniform circular motion and motion produced by gravitational force. (MDH)

Describes Ohio's Scenic Rivers Monitoring Program that uses benthic macroinvertebrates, such as the stonefly, mayfly, and water penny beetle larva, as key indicators of water quality and stream health. Presents a three-category scheme for invertebrates based upon their tolerance to pollution. Students can collect samples of these organisms,…

Authors have found that students have experience with metric units for volume and length; however, students have difficulty conceptualizing mass measurements in terms of grams and kilograms. Presents an activity, "Mass Appeal," where students use an equal arm balance to become familiar with the gram. (PR)

Discusses biological bafflers that can be used with any curriculum to motivate and instill a sense of wonder about the world. The following are some bafflers discussed: animal lovemaking--risky business; animal-size appetites; digging for gold; drinking, the unquenchable thirst; eating; hearing is believing; jumping and lifting contenders;…

Provides instructions for helping students construct a three-dimensional model of a constellation. Aluminum foil spheres with various diameters are used to represent stars with various apparent magnitudes. The positions of the stars in the model are determined from constellation maps and by converting actual star distances into millimeters. (PR)

Describes how teachers and students can conduct a schoolwide hazardous waste survey. The activity is an introduction to hazardous waste management and is useful in general physical science, chemistry, and environmental science classes. Two activity worksheets are provided. Explains how schools can clean up hazardous waste problems. (PR)

Two ways to visually enhance the concept of space curvature are described. Viewing space curvature as a meterstick contraction and the heavy banana "paradox" are discussed. The meterstick contraction is mathematically explained. (KR)

A quantitative application of magnetic braking performed with an air track is described. The experimental measurement of the position of the glider as a function of time is calculated. (KR)