Examines evolutionary trends, specifically trends in size, complexity, and fitness. Notes that documentation of these trends consists of either long lists of cases, or descriptions of a small number of salient cases. Proposes the use of random samples to avoid this "saliency bias." (SR)

Argues for an original structure for field guides, a structure that encourages induction on the part of the student and allows the student to create flexible taxa based on ecologically and evolutionary relevant field marks. Students will become more familiar with the multiple bases of taxonomy. (PR)

Discusses evolutionary theory for the universal human tendency to produce art. Presents ideas on the biological basis for aesthetic qualities. (PR)

This review of literature focuses on three decades of research related to precollege student understandings about the nature of science. Although the majority of studies show that student understandings are less than desirable, there is research that indicates that student conceptions are acceptable. (PR)

Reports on the meiosis models utilized by five individuals at each of three levels of expertise in genetics as each reasoned about this process in an individual interview setting. Results revealed a set of biologically correct features common to all individuals' models as well as a variety of model flaws (i.e., meiosis misunderstandings) which are…

Describes easy to implement exercises that are designed to promote interest in physics by changing the laboratory environment. (ZWH)

Describes an activity that demonstrates the effect of specific variables on the acidity of coffee. (ZWH)

Presents an informal evaluation of the Science as a Way of Knowing Project started in 1983. (PR)

A professor explains how he uses cartoons in teaching science. (PR)

Discusses research into problem-solving skills that have caused the theoretical methods of teaching and learning problem solving to evolve rapidly. Presents issues and questions that still need to be explored. (PR)

Stream alterations can occur in channels or in the watershed. This article describes the environmental impacts of channel manipulation. (PR)

A chemistry teacher describes the elements of the ideal chemistry textbook. The perfect text is focused and helps students draw a coherent whole out of the myriad fragments of information and interpretation. The text would show chemistry as the central science necessary for understanding other sciences and would also root chemistry firmly in the…

Lavoisier showed that water was formed by chemical reaction between hydrogen and oxygen. In Lavoisier's "Traite Elementaire" of 1789, he states that the reaction to form water requires exactly two volumes of hydrogen gas to react completely with one volume of oxygen gas. This was 20 years before Gay-Lussac studied the reactions between…

Reflects on the origin of the misconception of inverse respiration in green plants. Proposes a series of conceptual schemes that could form the basis for teaching the subject of green plants in a way that prevents or substantially reduces the appearance of this misconception in primary- and secondary-school students. Contains 33 references.…

Describes qualitative and quantitative methods used to elucidate the nature of the perception of the water cycle held by Botswana primary-grade pupils in three different geographic areas. Concludes that the students' perception of the water cycle was positively influenced by schooling but negatively impacted upon, to some extent, by the untutored…