Describes a demonstration using a variety of clear solutions in which the instructor asks students whether the solutions appear homogeneous or inadequately mixed. The solutions are then induced to fluoresce with ultraviolet light to provide visible evidence of homogeneity or nonhomogeneity. (PR)

Describes successes achieved in the use of active video techniques and discusses their potential contributions to science education on a national scale. (PR)

Utilizing the vast diversity of planktonic communities that exist in local, temperate ponds and lakes, the authors describe a simple exercise that gives students both a field and classroom experience in biodiversity. (ZWH)

Describes an innovative, but not revolutionary, secondary education science program that is modeled after American graduate education. Discussions include a comparison of pedagogical approaches, implementation, the teacher, facilities, and teaching strategies. (ZWH)

Demonstrates the use of a proactive approach to aid teachers in the prevention of behavior or management problems during a class field trip. An outdoor field exercise using string to define each groups' study area and focus student attention is included. (ZWH)

Describes an activity that allows students to develop their own animated models that depict the orbits of the earth and the moon. (ZWH)

Provides a graphing exercise designed to help students understand the coevolution of the physical environment and the biosphere during the last four billion years of Earth's history. The ideas are based upon the Gaia theory, which is the belief that the Earth is a self-regulating network of interdependent physical and biological systems. (ZWH)

Provides a framework for objectively selecting a biology textbook based upon credible recommendations from the professional literature. This framework especially draws from recent research findings in science, learning theory, and instruction. (Contains 25 references.) (PR)

This laboratory provides an easy and rapid way to introduce students to some of the exciting principles of gene regulation by analyzing expression of the lac operon of Escherichia coli. (PR)

Science fair mentorship programs let students investigate a wide variety of science topics under the guidance of interested community members. These programs enhance the relationships among school, community, and home. (PR)

Describes activities to help students overcome "microbe phobia" through "kitchen microbiology." Directions for making yogurt, sauerkraut, and root beer are provided. (PR)

Describes procedures for identifying the protein ribonuclease from plant tissue extracts using mini-gel electrophoresis. (PR)

Describes a simulation exercise involving an imaginary organism in which students study the effect of predation on allele frequencies, examine the assumptions of the Hardy-Weinberg law, and consider whether the need to survive is a guiding force in evolution. Includes instruction for conducting the exercise. (MDH)

Describes a six-week project, in which students ground their own mirror, built a working telescope, and learned how and why it all works. (PR)

Describes approaches and benefits of having students make observations and inferences from tracking-pattern diagrams and actual tracks made in sandboxes. (PR)