Describes the rationale and structure of a newly developed earth science program for elementary school children (K-3). The activities involve pre-operational and concrete operational stages, progressing from one to the other. Children show sustained interest and enthusiasm as they investigate landforms, the moon, fossils, and weather phenomena.…

Discusses three possible methods of thinking about the implications of the definitions of the Avogadro constant and number. Indicates that there is only one way to arrive at a simple and standard conclusion. (CC)

Discusses Copernicus' and Bruno's successes in astronomy with a background of changes in intellectual and academic freedom of their times. Stresses the importance of theoretical simplicity, mathematical beauty, and individual's extrication from prejudices in science research. (CC)

Develops a simplified electrostatic model of the heart with conduction within the torso neglected to relate electrocardiogram patterns to the charge distribution within the myocardium. Suggests its application to explanation of Coulomb's law in general physics. (CC)

Describes the establishment of a high school museum and outlines the value of student and community involvement in maintaining and building the collection. Students are enthusiastic in collecting, preserving, and identifying specimens, and volunteer as museum assistants. (JR)

Summarizes the history of concepts concerning the molecular nature of polymers, involving the carbon chain theory, graphic formula, polycondensation, colloidal properties, polypeptide hypothesis, secondary aggregation, and Watson-Crick model. Indicates that macromolecular science should be accommodated within the discipline of molecular science…

Provides various steps for preparing programmed instructional materials for teaching basic scientific skills to students. Author claims that programmed instruction approach is very useful and interesting for teaching skills. (PS)

Ten ideas are presented for classroom demonstrations in elementary schools. Topics covered include air pressure, siphons, electrostatics, melting point, and physiology of the human body. (PS)

Presents a teaching unit on the Langmuir absorption isotherm suitable for advanced secondary school chemistry classes. Describes the experimental investigation of the isothermal adsorption of sulfur dioxide on charcoal, and discusses the derivation of the Langmuir equation and some applications. (JR)

Describes the procedure for making a quantitative analysis of organic compounds suitable for secondary school chemistry classes. Using the Schoniger procedure, the organic compound, such as PVC, is decomposed in a conical flask with oxygen. The products are absorbed in a suitable liquid and analyzed by titration. (JR)

Includes eleven topics relating to laboratory activities, experimental procedures, and teaching materials suitable for secondary school chemistry classes. (JR)