Unusual experiments in sound are described. Sounds produced from the vibration of areas are represented by many beautiful sand patterns. The vibrating areas vary from square to circular plates. (SA)

Presents an nmr spectrometer-computer interface experiment in digital acquisition of spectroscopic data, which is intended for students nearing the end of a master's degree in physical chemistry. (HM)

Describes how plants can be produced by cloning by using tissue culture methods to mass-produce rare native prairie plants and trying to transfer some of the genetic characteristics of native grasses into cultivated cereals. The experiment was conducted at South Dakota State University. (HM)

Explains the origins of quasi-history in physics, and its aims of providing a framework for relevant scientific facts. Presents a large number of examples and discusses their effects on attitudes of students and others toward physics and science in general. (GA)

Contains a series of laboratory exercises students can do to introduce them to the basic concepts and techniques of water purification. (Author/MA)

The experiment described, suitable for undergraduate physical chemistry laboratories, illustrates the general principles of relaxation and introduces the nmr concepts of saturation and spin-inversion. (BB)

Checks on the logarithmic property of the eye in receiving light, by using estimation methods of how much brighter a light bulb looks than does its image in a window glass. (GA)

Describes a new physics program which depends mainly on student performed experiments and investigations, and subscribes to Piaget's learning and developmental theories. (GA)

Artists use red, yellow, and blue as primary colors, whereas physicists use red, green, and blue. Explains the reason using the spectra of mixtures of red, green, blue, and yellow tempera obtained with a Carey spectrophotometer. (GA)

Presents a method of studying RLC circuits with the help of the oscilloscope in the XYZ mode, complemented by an electronic device which generates a marker-trace on the screen and which is used to measure frequencies without the need of a reference point on the screen. (Author/GA)

Describes a computer aided analysis and subsequent assessment of analytical (pharmaceutical) chemistry data from an undergraduate laboratory course. (Author/GA)

Describes an exercise developed by the author to help college students to become familiar with the technique of photoelectric photometry of variable stars and permits each student to work with data he or she has personally obtained. (HM)

Psychophysical procedures provide the simplest method for studying time discrimination of animals. This experiment examines the psychological threshold of rats in estimating the time of occurrence of an event and how they adjust their behavior accordingly. Further research may determine the theoretical implications for both animals and people.…

Presents articles on: the measurement of flouride levels in natural waters; the effect of sunlight on the rate of chlorine decomposition in a swimming pool; and curriculum development in Australian agriculture science. (MLH)

Describes an experiment for an honors organic laboratory course that allows the student to approach a synthesis with independent planning and the use of the literature. (MLH)