The product test and an experimental approach to the guise of matter, constitutes one approach in learning about materials. (Editor)

Discusses expanding user community seeking access to synchrotron radiation sources, properties/sources of synchrotron radiation, permanent-magnet technology and its impact on synchrotron radiation research, factors limiting power, the density of synchrotron radiation, and research results illustrating benefit of higher flux and brightness. Also…

Uses an example of literature error to illustrate several principles often difficult to present to chemistry students. Indicates how the significance of previously reported experimental results is changed when previously reported assumptions are replaced by an alternative set of assumptions leading to a self-consistent interpretation of the…

Describes a group experiment demonstrating the use of conductivity measurements in the application of kinetic methods of nucleophilic aliphatic substitution. (CS)

The study and construction of sundials is a useful teaching aid at several levels of instruction, since it involves understanding the shape, divisions, and major motions of the earth. (Author/RLV)

A discussion of the aerodynamics of a boomerang as it relates to that of a golf ball. (BB)

Presents the views of a prominent molecular biologist regarding recombinant DNA research. Contained are arguments for continuing research and a reassurance that the potential hazards from this type of research are overstressed. (CS)

Describes a DNA fingerprinting simulation that uses vegetable food coloring and plastic food containers instead of DNA and expensive gel electrophoresis chambers. Allows students to decipher unknown combinations of dyes in a method similar to that used to decipher samples of DNA in DNA fingerprint techniques. (JRH)