Describes a science activity that involves dropping weighted strings from a second floor window or the top row of gymnasium bleachers. The activity, which takes only a few seconds, helps students understand the physics concepts of speed, acceleration, and terminal velocity. (TJQ)

Presents the "Before Technology and After Technology" lab where students first complete a simple lab and graph the data by hand and then repeat the lab using graphing calculators. Enables students to see how technology can make data collecting, graphing, and analyzing more fun. (JRH)

Presents a case study of an unsafe situation in a science laboratory and its administrative consequences. Discusses issues related to laboratory safety and faculty evaluation. (JRH)

Describes hardware that enables the use of an IBM PC microcomputer as a frequency meter or a counter by using the parallel printer port. Eliminates the 16-bit time-day counter through the use of an external time base that can be conveniently set depending on the desired frequency range. (JRH)

Presents data collection activities for the home, school, and community that encourage students to summarize, interpret, and draw inferences. Four types of activities are discussed: observations, surveys, experiments, and sampling. (Author/MKR)

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)