Summarizes research into how children perceive three-dimensional objects. Focuses on the difficulty that students have in appreciating how the orientation of the semicircular canals affects balance and space perception. (DDR)

Describes a procedure developed by students that measures the mass concentration of particles in a polluted urban atmosphere. Uses a portable fan and filters of various materials. Compares students' data with official data. (DDR)

Presents an activity that explores the factors affecting the rate of a chemical reaction. Contains information for the instructor such as details about the chemistry of the reaction, answers to student questions, and sources of additional information and related activities. (DDR)

Presents an analogy used in introductory college chemistry to help students understand the procedure for determining the percentage purity of sodium carbonate. Employs a monetary analogy. (DDR)

Cites three incidents of cargo being lost at sea. Discusses ocean currents and directs students in an activity to explore what happens to the floating debris from lost containers. (DDR)

Presents Living in Water, an aquatic science curriculum for grades five through seven that includes 50 activities divided into six sections. Focuses on the nature of content of the related workshops. (DDR)

Presents an overview of a museum teacher-in-residence program in which support is given for the development of curriculum materials relating to hands-on science instruction. (DDR)

Describes procedures for a demonstration that features an exploding can. This demonstration prompts students to critically analyze the release of energy in an exothermic reaction, the work done in such a reaction, and the enthalpy. (DDR)

Describes a revised laboratory set-up for performing flame tests that enables students to pay more attention to the results of the tests and less attention to the manipulation of equipment. Employs a watch glass to add the analytical solutions to the flame. (DDR)

Presents the ninth story in a series of chemical mysteries with emphasis on forensic chemistry, physical properties, and qualitative organic analysis. The mystery centers around the adventures of Sherlock Holmes. (DDR)

Describes a laboratory protocol optimizing the conditions for the assay of pepsin activity using the Coomasie Blue dye binding assay of protein concentration. The dye bonds through strong, noncovalent interactions to basic and aromatic amino acid residues. (DDR)

Discusses applications of recombinant DNA technology and the controversies surrounding that technique. Provides a cooperative learning project idea that involves teams of students investigating and debating these issues. (DDR)

Details the use of the game Yahtzee with modified rules to help students understand the extreme improbability of obtaining complex structures by chance in the process of evolution. Includes a discussion of probability calculations. (DDR)

States that the ecological role of Sphagnum species in peatlands is enormous. Presents a cation exchange experiment and background information on the characteristics and economic importance of Sphagnum. Contains 42 references. (DDR)

Describes how high school biology students use the clam to study the bivalve body plan anatomy. Employs an open-ended investigation format that is rich with measurement opportunities including body mass, valve mass, and volume. (DDR)