This article explains a simple way to demonstrate natural convection, such as from a lit candle, in the classroom using an overhead projector. The demonstration is based on the principle of schlieren imaging, commonly used to visualize variations in density for gas flows.

You can't see, smell or taste air - but here's an easy method for experimenting with it. (Editor)

Discusses Campbell's theorem for the evaluation of fluctuation in system outputs as a basis for presenting a discussion of electrical noise in an undergraduate physics course. (SL)

This paper examines and tests the assumptions that a curriculum which adequately portrays instructional strategies (related to teaching the nature of science, science curricular content, and teachers' views of the nature of science) will increase students' understanding of the nature of science. This study was conducted over a 16-week period. A…

Reports on a study to elicit junior secondary students' understandings of the nature of science (NOS) through peer collaboration instruction based on science stories specifically developed to present several aspects of NOS. Investigates how students reacted to the stories and whether they were able to extract the aspects of NOS presented in the…

Discusses the National Academy of Science's recommendations on teaching evolution and the nature of science. Describes a biology college course that uses evolution and history of life as the curriculum framework with an extensive unit on the history and philosophy of science. (Contains 14 references.) (ASK)

Science controversy has the potential to reinforce students' understanding of important biological concepts as well as helping students forge connections between concepts they may have previously seen disparate. Science controversy has the potential to help students make cross-disciplinary connections and therefore it should become an integral…

An activity to promote student understanding of the nature of science as a method of inquiry by engaging students in a real-life experience that requires them to utilize their critical thinking skills is designed. The activity links scientific concepts to the real world experiences of students and increase the relevancy of the content.

The aim of this article is to examine how drama and theatre activities may enhance learning in science education, by creating a learning situation that is significant in the lives of students. The author offers a structured survey of different science and drama projects, together with theoretical reflections on the use of drama in science…

Physicists have known for some time that pendulum motion is a useful analogy for other physical processes. Chemists have played with the idea from time to time but the strength of the analogy between pendulum motion and chemical processes has only received prominent published recognition since about 1980, although there are details of the analogy…

The implications of history and philosophy of chemistry are explored in the context of chemical models. Models and modeling provide the context through which epistemological aspects of chemistry can be promoted. In this work, the development of ideas and models about acids and bases (with emphasis on the Arrhenius, the Bronsted-Lowry, and the…

We describe a longitudinal study of a secondary education biology teacher at two moments in her career (1993-2002), determining the changes in her conceptions of the nature of science and its teaching and learning, and the factors that favored or hindered such changes. The changes were analyzed using cognitive maps, constructed on the basis of the…

This article is about an investigation of six middle school science teachers' beliefs and instructional practice about the coherence of the science they teach as articulated by National Science Education Standards (NRC, 1996). Many well intentioned reform efforts focus on improving content knowledge of teachers, but many classroom teachers…

A science toy sometimes called the "magnetic spinner" is an interesting class demonstration to illustrate the principles of magnetic levitation. It can also be used to demonstrate Faraday's law and a horizontally suspended physical pendulum. The levitated part contains two circular magnets encased in a plastic housing. Each magnet stays…

When studying wave interference, one often wants to know the difference in path length for two waves arriving at a common point P but coming from adjacent sources. For example, in many contexts interference maxima occur where this path-length difference is an integer multiple of the wavelength. The standard approximation for the path-length…