Teachers may introduce students to anamorphic art (images designed to be looked at with conical mirrors or with mirrors diagonal to the image) with inexpensive cylindrical mirrors. By using polar graph paper, images can be made "correctly distorted" and will appear normal when viewed with a cylindrical mirror. (DH)

Outlines an activity in which students clarify choices among personal and ecological values. Variables (including concerns of the natural environment and personal income) are rated from high to low within a total constraint set by the instructor. Uses of the activity in a college geology course for nonscience majors are discussed. (DH)

Reviews methods of determining apparent dip and highlights the use of a device which consists of a nomogram printed on a protractor. Explains how the apparent-dip calculator-protractor can be constructed and outlines the steps for its operation. (ML)

Describes a simple undergraduate experiment in chemistry dealing with the "solvent effects" in nuclear magnetic resonance (NMR) spectroscopy. Stresses the importance of having students learn NMR spectroscopy as a tool in analytical chemistry. (TW)

Introduces a system for grading independent research projects. Recommends the use of three grading periods to avoid the overload of the grading duties in short periods and to provide students step by step guides. Shows an outline of the system including due dates, duties and grading criteria. (YP)

Presents a laboratory exercise suitable for advanced placement biology or chemistry classes. Discusses the theoretical approach, preparation and standardization of reagents, and results. Emphasizes standard analytical procedure and chelometric titration. (CW)

Describes a simple hands-on model of water-rock interaction that can be constructed in the classroom using styrofoam bowls and foil-wrapped candies. This interactive simulation allows students to vary the factors which control water-rock interaction and to obtain immediate results. (Author/CW)

Introduced is a magnetic compass with no moving parts. Presented are the principles of the compass and the method to make the compass. Shows a lodestone compass which is the most primitive compass form. (YP)

Presented is a simple demonstration of siphon action by using straws without sucking, or filling and closing one end. Includes the method, figures of the demonstration, and four questions for students on the demonstration. (YP)

Presents an apparatus, a solid-state sound generator in a plastic ball. Includes pictures of the ball and a diagram of the piezo horn. (YP)

Shows how a baseball having a built-in clock can be used for measuring ceiling height. Suggests other questions to investigate. (YP)

Introduces a life science classroom activity for developing a knowledge of the human skeletal system, environmental poisoning, and bone growth pattern. Provides the situation, an organizational flow chart, relevant information materials, and directions. (YP)

Describes a series of activities and demonstrations involving the science of soap bubbles. Starts with a recipe for bubble solution and gives instructions for several activities on topics such as density, interference colors, optics, static electricity, and galaxy formation. Contains some background information to help explain some of the effects.…

Described is the separation of dyes using a conventional liquid chromatographic pump and a glass column. Included are the preparation of the column and dye separations. (CW)

Describes the construction and uses of a low cost fermenter reaction vessel which is suitable for laboratory growth of microorganisms by continuous and batch cultures from plastic soft drink bottles. Lists materials, discusses modifications that can be made and gives examples of use. (CW)