Outlines a module developed with the aim of teaching a group of secondary science students several learning strategies which could be transferred into classroom learning. Students demonstrate that knowledge about "elaboration" and the linking of new learning to previous knowledge enhances learning and understanding of scientific concepts.…

This review summarizes the different candidate AIDS vaccines currently being developed and outlines some of the problems attending vaccine research. (PR)

Describes the following examples of natural selection for use in science instruction: sickle-cell anemia and human beings, clogged crabs, the rounding of the human head, shell color in land snails, pollinator behavior and flower color, copper tolerance in a grass, lizards and quick change, and Darwin's finches. (PR)

Antagonism is the production of substances by microorganisms that inhibit or prevent the growth of other bacteria. This paper demonstrates the antagonistic behavior of gram-positive coccus on the B. subtilis and Enterococcus faecalis gram-positive microorganisms, showing that the process of antagonism is sometimes dependent on the nutritional…

Presents and explains motion illusions that show how the eye and mind can fool the viewer into seeing or interpreting information that is different from the actual images presented. (PR)

Describes thought-provoking activities with the Cartesian Diver system. Presents student answers explaining the phenomena. (PR)

Describes amber and its hardened form called copal. Explains how amber is formed and where it comes from. Discusses possibilities of obtaining DNA from insects caught in amber. (PR)

Gold's physical and chemical properties are without equal for use in high-tech fields such as medicine, space, architecture, and electronics. This article, with an accompanying poster on gold, contains the following sections: Lore and Legends; Matter, Metals, and Minerals; The Origins of Gold; Mining and Recovery; Cultural Crossroads; Modern…

Describes symbiosis and its significance in the day-to-day lives of plants and animals. Gives specific examples of mutualism, commensalism, and parasitism in the relationships among fungus and plant roots, animals and bacteria, birds and animals, fish, and predator and prey. (MDH)

Describes an initiative to develop and incorporate early Chinese scientific ideas into the teaching of physics in Hong Kong schools. Provides the background and rationale for the development and gives as an illustration an account of some of the scientific ideas included. Ideas include the Chinese magic mirror, force and motion, and atomic theory.…

Presents two experiments that demonstrate phase changes. The first experiment explores phase changes of carbon dioxide using powdered dry ice sealed in a piece of clear plastic tubing. The second experiment demonstrates an equilibrium process in which a crystal grows in equilibrium with its saturated solution. (PVD)

Attempted to examine the process of conceptual-change teaching through an Internet discussion, part of a distance-education teacher-training course, involving approximately 40 teachers. The prior beliefs of these teachers about science and science teaching may have hindered change and limited their willingness to explore the designated subject on…

Examines children's (n=306) drawings of a river basin to determine their understanding of scientific concepts related to the water cycle. Presents exemplars of five levels of understanding and analysis of the drawings' orientation and content. Contains 24 references. (Author/WRM)

Presents a qualitative activity whereby students observe the effects of temperature on commercial lightsticks. Includes Internet resources. (WRM)

Suggests activities for studying the variety of life forms found and the interaction of living things during a class trip to the beach. (WRM)