Describes four experiments that enable students to explore the phenomena of evaporation and condensation and determine the relative humidity by measuring air temperature and dew point on warm September days. Provides tables to calculate saturation points and relative humidity. (MDH)

Provides instructions to build an inexpensive device to demonstrate wave-motion to elementary school children. (MDH)

Concepts of authority with regard to type of authority directive and social context were studied for 30 male and 30 female elementary school students in 3 age groups from kindergarten through grade 6. Children conceptualize authority with respect to social position and within the bounds of specific social contexts. (SLD)

Investigates the effectiveness of two different types of interviews: one that embeds a concept map, and one that does not embed a concept map in order to elicit post-instructional understandings. Focuses on students' understandings of chlorofluorocarbons and their role in global atmospheric change. Contains 71 references. (DDR)

Reviews research on children's ideas about floating and sinking. Describes the Model-Assisted Reasoning in Science (MARS) project curriculum and student responses to a question about helium balloons. Contains 61 references. (DDR)

Assessed 32 kindergartners' prior knowledge of left and right, then exposed experimental group to software program "Jellybean Hunt" from Edmark Corporation's "Trudy's Time and Place House." Found that students exposed to the software significantly increased their scores on the posttest measure of their understanding of the…

Observes several regular error patterns when a group of seven-year-old Italian children transcode arabic numerals to verbal numerals. Explains the development of transcoding ability by an asemantic model using production rules. Contains 15 references. (Author/ASK)

Argues that the nature of science has not been emphasized effectively in the professional training of scientists in Pakistan. Describes how the development of science-process skills, an inquiry approach, and constructive learning is delayed. (DDR)

Reviews a simple theory that describes the bounce of an air-filled ball and predicts that the contact time should be independent of the speed of impact. Presents experimental results that disagree with the theory and an alternative model that agrees with experimental results. (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)

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)

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)

Takes a situated-cognition perspective on learning and cognitive development. Presents a detailed framework that includes operationalizations for levels of situated learning. Contains 31 references. (DDR)

Reports on a year-long study implemented in grade seven life-science classes with the students' regular teacher serving as a teacher researcher. Results suggest that concept mapping may be useful in assessing declarative and procedural knowledge. Contains 43 references. (DDR)