The fourteen-year life story of a sealed terrarium is presented. (BB)

Describes a demonstration concerning the air pollution aspects of gasoline vapor which provides an estimation of the vapor pressure of test fuel, the molecular weight of the vapor, and illustrates a method of controlling the pollution. (SL)

Presents seven topics suitable for a secondary level introduction to geochemistry. (SL)

Describes an exercise in measuring gravity with and without a falling object for a time reference. (SL)

Describes a simple experiment to verify the reflectivity equations of Fresnel and for measurement of optical constants. (SL)

Describes an experimental verification of Stefan's law using commercial electric lamps. (SL)

Describes a holographic method of producing a picture of a real lens, objects, and the virtual image of the objects. (SL)

Describes a magnetic resonance laboratory experiment for a biochemistry course. (SL)

Describes several plasma physics experiments suitable for undergraduate physics laboratories. (SL)

Describes experiments for preparing compounds containing cooper and nickel in the +3 oxidation state. (SL)

Describes experiments with and preparation of Manganese (III) for demonstrating the reactions of ions from the first transition metal series. (SL)

Describes energy related investigations which can be performed in the elementary classroom utilizing the yo-yo. (SL)

Reviews techniques for energy conservation in the home. (SL)

Describes an experiment demonstrating the frustration of totally reflected visible light. (SL)

A sample run of a program intended for use by students with access to a teletype or visual display computer is shown. The program is satisfactory for the testing of the law for up to about 20 generations using any valid set of frequencies for genotypes. (AJ)