An atlatl is a thrower for propelling a flexible dart through the air. Describes a class investigation for making an atlatl using a piece of dowel. (Author/MM)

Describes a simple exercise in percolation theory that can be performed easily and quickly in a laboratory using paper and a hole punch. (Author/MM)

Advances in the chemical and materials sciences have had dramatic impact on sporting events. Discusses some of the chemicals and materials involved in these advances with the intention of providing a mechanism to interest students in chemistry. Presents structures and properties of some materials that led to their adoption in sports and ideas for…

Describes a simple laboratory activity illustrating the chemiosmotic principles of active transport in yeast cells. Demonstrates the energy coupling mechanism of active a-glucoside uptake by Saccaromyces cerevisiae cells with a colorimetric transport assay using very simple equipment. (Contains 22 references.) (Author/YDS)

Describes a classroom activity that teaches the mechanism of genetic drift to undergraduates. Illustrates a number of concepts that are critical in developing evolution literacy by sampling M&M milk chocolate candies. (MM)

Presents a simple experiment to help students visualize the concept of displacement current. (CCM)

Examines the simultaneous occurrence of ultraviolet light and the photoelectric effect. (CCM)

Introduces a science unit on heart rate variability (HVR) patterns. Uses spectral analysis to determine the effects of environmental stimulants such as music and emotional stress on heart rate. Observes relaxation techniques and their effects on the autonomous nervous system. (Contains 12 references.) (YDS)

Presents a learning project in which students prepare a guided, multisensory rain forest tour representing its ecology. Develops five stop points presenting a theme or an important aspect of the rain forest. Includes a list of selected resources for rain forest studies. (YDS)

Reviews some ways in which developments in biotechnology can be used to explore both biology and the social impact of this science on the wider community. Includes specific examples to help students explore the ramifications of biotechnology. Reviews approaches that can help teachers help students address social, ethical, and political issues…

Presents activities on evolution and describes how to integrate lessons on evolutionary biology. (YDS)

Presents a case in which a congressional staffer must weigh a number of competing needs, including the popular reaction to genetically modified organisms (GMOs) and the need to eliminate vitamin A deficiency, in deciding how to present information to her boss, an influential congressman drafting legislation to support agricultural research.…

Explores various theories for the extinction of the great Ice Age mammals and Homo neanderthalensis. Presents an activity in which students research evidence for and against the various hypotheses, then meet in class to discuss the merits of each. (Author/ASK)

Introduces the Clean Air game which teaches about air quality and its vital importance for life. Introduces students to air pollutants, health of people and environment, and possible actions individuals can take to prevent air pollution. Includes directions for the game. (YDS)

The current time "measuring system" has taken on a life of its own, bearing only an approximate resemblance to the natural occurrences it set out to measure. The "analemma equation of time" was created to precisely set our clocks by converting irregular sun time to the even, regular tempo of mean time. In this article, the equation is described in…