Provides instructions for the construction and launch of a two-liter plastic soda-bottle rocket and presents the author's theory of their motion during launch. Modeled predictions are compared with actual experimental data. Explains theory behind the motion of a water rocket during launch. (LZ)

Benefits and limitations of structural equation models for multivariate experiments with incomplete data are presented. Examples from studies of latent variable path models of cognitive performance illustrate analyses with latent variables, omitted variables, randomly missing data, and nonrandomly missing data. (SLD)

This activity attempts to address a lack of emphasis in most science curricula on the microbial activity that determines soil's health. Presents an experiment that involves students in seeing how the enzyme assay is used as an indicator of soil quality and microbial activity. Contains procedures and discussion questions. (LZ)

Discusses a dimension of hermeneutics in science that has to do with the production of the experimental object, or with act rather than text hermeneutics. Examines the hermeneutics of experimentation and differing perspectives of technique. (LZ)

Introduces a range of simple ideas about soil physical properties using a minimum of apparatus. (MKR)

In Putnam County, Ohio, an integrated curriculum applies science and math through enhancements to hands-on laboratory components and linkages with local manufacturers. The high school students learn to apply theories to real-world situations, develop teamwork skills and computer literacy, and learn about local employers. (SK)

Provides the background theory and some experiments for studying static equilibrium using a Slinky. (MVL)

The molecular properties of Human Immunodeficiency Virus type 1 (HIV-1) reverse transcriptase are summarized and several strategies developed to inhibit its activity are described. (MSE)

Discusses studies of the neurobiology of memory and cognition. Presents the findings of anatomic and physiological studies of monkeys that have led to discoveries about the structure of working memory. (MCO)

This pathfinder was originally prepared for "Biomedical Research and Animal Rights," a session sponsored by the Veterinary Medical Libraries and Research Libraries Sections of the Medical Library Association. Current resources are described, from bibliographies to electronic bulletin boards, which relate to the issue of laboratory animal…

Six articles about evaluating information retrieval (IR) systems and methods are briefly described in this introduction to a special issue and some of the major problems that are encountered in evaluating interactive information retrieval are considered. (two references) (LAE)

Equipped with a little more than batteries, food-dye, and sieving media, teachers can demonstrate an essential process used in biochemical research. An activity is provided to aid in helping students to understand electrophoresis. (ZWH)

Reviews two projects studying the nature of mental representations of space induced entirely by language. The first project investigates perspective in descriptions of large-scale (e.g., convention center, town) space. The second project investigates mental representations of objects located immediately around the body. (37 references) (KRN)

Reports on the successful classroom use of commercial fertilizers as growth media. (ZWH)

Describes an investigation for physical science and chemistry students that engages students both physically and mentally. (ZWH)