Discusses the principles of sustainability and how it relates to human impact on the environment. Describes modern society as a paragon of waste in contrast to natural ecosystems. (PR)

Describes experiments by Thomas A. Knight on geotropism. These experiments took place about 200 years ago and used a centrifuge. (PR)

Describes an interview-a-scientist assignment for preservice elementary teachers. Preservice teachers realized that scientists frequently repeat experimental work, that science is not neat and tidy, and that science requires patience and perseverance. (PR)

Presents activities and learning outcomes that came from a project studying the agricultural and architectural technologies of the Hupobi Pueblo who lived in New Mexico some 500 years ago. A large poster with the activities is presented. (PR)

Describes using the aquatic plant, duckweed, for open-ended investigations and learning about factors important in photosynthesis. (PR)

Describes the new public television series called "The Secret of Life," and explains how the program can be used in an elementary school classroom. Large color poster is included. (PR)

Students experience the distinction between observable fact and scientific theory by taking a critical look at how spaghetti can be sucked up into the mouth. A demonstration shows that air is needed to suck up the spaghetti but that the scientific explanation is not as simple. (MDH)

Presents an activity in which students model the processes of meiosis, fertilization, development, and birth using model creatures called reebops. Students breed reebops to analyze chromosome combinations. Makes recommendations for activity utilization and identifies the strengths of the activity. (MDH)

Describes activities in which students learn that it takes teamwork, problem solving, and personal commitment to save the environment. (PR)

Discusses the necessity of effective AIDS/HIV education in the secondary schools, its inclusion in the biology curriculum, and methods of educating teachers concerning the topic. Provides recent data related to AIDS and proposes that science teacher stress abstinence and behavior modification as possible solutions. (MDH)

Outlines the stages of a cell biology "pulse-chase" experiment in which the students apply autoradiography techniques to learn about the concept of the cell cycle. Includes (1) seed germination and plant growth; (2) radioactive labeling and fixation of root tips; (3) feulgen staining of root tips; (4) preparation of autoradiograms; and…

Describes an activity in which students look at photographs of different cats to determine the genotypes of the various characteristics observed. Provides a student worksheet. (MDH)

Ethnobotany is the scientific investigation of plant use by indigenous cultures for food, medicine, pesticides, and other purposes. Discusses the significance of ethnobotany and provides resources and laboratory activities suitable for use in biology and botany courses at the high school and college levels. (MDH)

Describes using the common house plant, "Coleus blumei," to illustrate gravitropic effects, phototrophic effects, and hormonal effects in plants. (PR)

Argues that a skills-based approach for the assessment of laboratory work is philosophically unsound, educationally worthless, and pedagogically dangerous. Proposes an alternative, holistic approach to assessment, based on a more valid model of scientific practice. (Contains 38 references.) (MDH)