Reviewed is the discovery, nuclear and chemical properties, and uses of an isotope of Americium (Am-241). Production and separation techniques used in industry are emphasized. Processes are illustrated in flow sheets. (CW)

Discussed are concepts involved in legal liability for laboratory accidents. The focus of this article is on negligence, duty, and responsibility issues. Highlighted are the basis of a lawsuit, negligent tort, duty and breech of duty, and cause and harm. Thirty-one cases are cited. (CW)

Examined was the possibility that the language teachers use to communicate science content may provide the context in which students formulate a world view of science. Results are presented and the implications of these results for teacher education programs are discussed. (Author/CW)

Describes a strategy which uses writing to help students learn science concepts. Provides a description of the target population, a justification for the various components of the strategy, and information on brainstorming and concept map formation. Reports that use of this method enhances students' interest, motivation, and understanding of…

Discusses the hazards of nitric acid and other nitrates, especially ammonium nitrate in the high school laboratory. Provides many historical accounts on the dangers of nitrates. (MVL)

Uses a discrepant event to teach students about volume and area. Outlines directions for class demonstration, needed materials, questions, a story problem, and related activities to perform this assignment. (Author/RT)

Discusses a unit on nuclear technology which is taught in a physics class. Explains the unit design, implementation process, demonstrations used, and topics of discussion that include light and optics, naturally and artificially produced sources of radioactivity, nuclear equations, isotopes and half-lives, and power-generating nuclear reactors.…

Explains the use of mean and median as grade averaging procedures for students in science. States that using the median produces numerous advantages for student and teacher. (RT)

Describes a program in which second-year biology students use plasmid isolation to remove DNA from Escherichia coli bacteria and subsequently ligate and transform it into other E. coli bacteria. Cites ways teachers can get involved in current research that allows student participation. (RT)

Describes an activity in which students graph changes in tides and ocean levels over a period in order to obtain a visual representation of the changes taking place and their effects upon the Earth. Provides questions for students to answer after construction of the graphs. (RT)

Describes examples of force in daily living. Discusses some examples of gravitational, internal, external, and centrifugal forces in various situations by using force vectors with diagrams. (YP)

Discusses the presentations of chemical demonstrations, hands-on experiments, and magic shows. Presents 12 guidelines to follow when presenting chemical demonstrations. Points out the obligations of the presenters for the safety concerns of the general public. Notes information available from the American Chemical Society. (MVL)

Describes a method for making a simple, inexpensive apparatus which can be used to determine Planck's constant. Provides illustrations of a circuit diagram using one or more light-emitting diodes and a BASIC computer program for simplifying calculations. (RT)

Presented are two chemistry demonstrations: (1) an alternative method for the demonstration of the properties of alkali metals, water is added to small amounts of metal; (2) an exploration of the properties of hydrogen, helium, propane, and carbon dioxide using an open trough and candle. (MVL)

Examined are boys' and girls' achievement from a developmental perspective over the three years of science curricula. Results show the overachievement of girls relative to boys in both chemistry and physics in grades 10 through 12. Discusses implications of the results. (YP)