Provides three examples of paradoxes from physics and one from astronomy to show how paradoxes may be used in addressing specific deficiencies in understanding. (CS)

Describes an undergraduate experiment designed to verify quantitatively the effect of a dielectric fluid's dielectric constant on the observed wavelength of microwave radiation propagating through the fluid. The fluid used is castor oil, and results agree with the expected behavior within 5 percent. (Author/CS)

Demonstrates an extension of the customary discussion of rotations to produce naturally a number of augnear momentum operator properties, if coordinate-free rotation operators are used in their exponential form. This form gives rise to a particularly useful coordinate-free representation of the generators of rotations in three-space. (CS)

Discusses the problem of the mathematical pendulum in its classical, semiclassical, and quantum aspects. The energy spectrum and its eigenfunctions are presented under the usual requirement of single valuedness of the solutions. (Author/CS)

Listed are chemicals commonly used in the science classroom, including restrictions for classroom use. Based on recommendations of the Association for Science Education. Seven categories of restrictions are imposed, and each chemical listed has one or more restriction. When appropriate, an alternative chemical is suggested. (DS)

Discusses key concepts when considering the thermodynamics of adsorption using gas-solid chromatography. (CS)

Describes an experiment in which Fresnel diffraction patterns were observed with a beam of slow neutrons of wavelength 4.33 Angstroms. (MLH)

Discusses the origin of surface tension in terms of the basic molecular nature of liquids and the contractile property of surfaces. (MLH)

Describes how the use of tunable lasers in coherent Raman techniques allows spectra to be taken for samples in which spontaneous Raman scattering is intrinsically weak. (MLH)

Presents a demonstration to show the formation of images in the retina in normal vision, in farsightedness, and in nearsightedness using only a 35mm slide projector. (MKR)

Discusses the nature, resolution, focal length, and angle of a pinhole camera. Describes the development and some applications of the camera. Nineteen references are listed. (YP)

When it comes to selecting science trade books, there are plenty of lists and guides that identify good books; however, when it is time to create a unit or add to the classroom library, selecting appropriate books can still be a challenge. Recommended books may not be available in the school or local libraries, and budget constraints may prohibit…

It is of critical importance in the Asia/Pacific region to produce quality science books which are attractive and interesting for children and youths and which can also stimulate their interest in science and provide them with accurate scientific knowledge in an easily understandable way. This publication is a report of a training course on book…

Describes the construction of a demonstration to show optical activity of table syrup. (Author/CP)