Described are demonstrations of the optical activity of two sugar solutions, and the effects of various substituents on acid strength using an overhead projector. Materials and procedures for each demonstration are discussed. (CW)

Described is a demonstration in which the reaction sequence can be easily followed since the reactant, intermediates, and the final product have intense and different colors. Materials and procedures for this demonstration are discussed. (CW)

Three uses of this method with sandstone, desert varnish, and granite weathering are described. Background information on this technique is provided. Advantages of this type of microscopy are stressed. (CW)

Describes a class activity, a game called "Beware--Radiation," developed as a framework for the introduction of the topic of radiation. Reports that both students and teachers had similar and mostly wrong preconceptions. (Author/YP)

Describes a fieldwork project in archaeology for teachers. Discusses one teacher's involvement in the Nevada program including field techniques and the development of a classroom lesson. Gives an address for obtaining information about the program. (CW)

Presents experiments which show that in electrostatics there are logical reasons for describing charged materials as positive or negative. Indicates that static and current electricity are not separate areas of physics. Diagrams of experiments and circuits are included. (RT)

Discusses a research project of testing detergents that resulted from students' classroom observations of and questions about water pollution and suds. Outlines procedures and responsibilities necessary for conducting the experiment. A sample student data sheet is included. (RT)

Provided are copy masters, instructions for use, and grading criteria for six problems used as part of the practical assessment for a modular science course. Each problem gives a narrative and a list of materials necessary to complete the problem. (CW)

Discusses the missing water on Mars. Describes five experiments simulating conditions on Mars: (1) behavior of dry ice; (2) low-pressure vacuum; (3) freezing point depression; (4) water in hydrated minerals and clay; and (5) properties of carbon dioxide. (YP)

Discusses simple analysis of urine in the classroom. Describes the materials and procedures for the analysis. Provides a laboratory report giving characteristics of: (1) odor, color, and clarity; (2) specific gravity; (3) sediment; (4) test strips; and (5) albumin and phosphates. (YP)

Examined are the illustrations and descriptions of the molecular structure of sulfur dioxide found in selected chemistry textbooks. Inconsistencies and incorrect information are indicated. It is suggested that molecules other than sulfur dioxide be used as examples of molecules for which resonance is important. (CW)

The construction and uses of a device to facilitate the use of an overhead projector to show chemical reactions is presented. Materials and instructions for construction as well as reactor vessels are discussed. (CW)

Described is an activity in which students locate the epicenter of several earthquakes, plot the trends of the two faults involved, and determine the sense of motion along the plane of the two faults. Provided are objectives, background information, procedures, and data necessary for the activity. (CW)

Presented is an activity in which a mystery setting is used to motivate students to construct their own decay curves of melting ice used as an analogy to radioactive decay. Procedures, materials, apparatus, discussion topics, presentation, and thermodynamics are discussed. (CW)

Listed are 100 trade books with brief descriptions and availability information. Categories include animals, biography, space science and astronomy, anthropology and paleontology, life sciences, earth science, conservation, medical and health sciences, physics, technology, and engineering. Criteria for inclusion in this annual list are presented.…