Provided are two experiments which deal with the formation of callus and embryos from tissue culture of carrot roots. Outlined are the purpose, materials, procedure, and results for each. (RT)

Describes the Seabase America project, undertaken by the Copley-Fairlawn Schools in Ohio, in which over 100 high school students spent 6 days living and working in 10 interconnected geodesic domes in a simulated undersea research station. Students engaged in various scientific and educational activities. The project also accommodates elementary…

Describes a science unit used in a fourth-grade class to teach students about Bernoulli's law of flight, the similarity of tetrahedrons to birds, and the construction of tetrahedron kites. Also includes thought-provoking math questions for students. (MDM)

Describes the activities of the Physics Teachers Action Research Group in which college physics teachers work together in planning, revising, and evaluating student projects that foster greater conceptual understanding and address student misconceptions. Presents the details of a project in which students were asked to build an accelerometer. (JRH)

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)

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 describe a set of controlled ecosystems that can be used to demonstrate the effects of herbivory on the health and growth of a plant population and of predation on the growth of a primary consumer population. The system also shows the effectiveness of biological pest control measures in a dramatic way. The construction of the ecosystems is…

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)

The director of the Marine Systems Laboratory of the Smithsonian Institution discusses steps in developing ecological models. The following topics in using an aquarium for the ecosystem are described: lighting, water motion, water quality and filtration. Presents information on choosing living organisms for the ecosystem. Describes potential…

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)

Provides insights for college-level teachers beginning their tasks of directing student research. (PR)

Describes the use of "contracting" as a method to remind students of the importance of independent investigations. The contract is an agreement for learning between the student and professor. (PR)

Considers the ways in which students' activities during project work are influenced by their images of science. Finds that the concept of "epistemic demand" may help in anticipating difficulties students might have during science project work, and that students' images of science are developed as a result of implicit and explicit…