Describes a laboratory investigation designed to analyze surface area to volume ratio related to cell division. Uses agar-gel "cells" with pH indicator added which are then "fed" acid for a measured time. Discusses procedures and materials used, providing a sample data table and important guiding questions. (JM)

Measurement of harmonic amplitude and phase response are discussed, focusing on an instrument used to demonstrate motion of a damped system when oscillating freely and motion of the same system when driven into harmonic oscillation. Includes procedures, sample results, and comparison of results to values calculated from geometry of the system. (JM)

Experiments which illustrate the effect of humidity on human hair and on paper are described. Also described are two ways to make a hygrometer. These methods were found in a series of British television programs (also available in the United States). Comments on the programs are included. (JN)

Examines the extent to which issues related to animal experimentation are in conflict and proposes choices that might least comprise them. These issues include animal well-being, human well-being, self-interest of science, scientific validity and responsibility, progress in biomedical and behavioral science, and the future quality of medical care.…

Discusses two activities suitable for group involvement or demonstration purposes. The first focuses on factors which determine how much time an object (such as a ball) will take to fall to the ground from a certain height. The second concerns the nonconservation of volume when two soluble liquids are added together. (JN)

Describes an experimental biochemistry course designed to teach basic biochemical techniques using an unstudied enzyme as the experimental material. Explains the schedule of experiments designed for the course and lists the sources used. (GS)

Describes the use of integrated circuit voltage regulators in electrolytic titration instruments. (MLH)

Described is the equipment and procedures used to prepare and display petrological (thin rock) sections without the use of sophisticated apparatus. (SL)

The relationships among sex of expressor, sex of judge, intensity of affect expressed, and the spontaneous attribution of emotionality were explored. (Editor)

Tests the validity of hypotheses concerning the effects of films on opinion formation. Reports on experiments using two third-grade classes and a conservation film produced for primary-school-age children. (Author/RK)

Discusses a high school laboratory in which the students take an active role in designing, implementing, and performing experiments concerning basic concepts in physics. (MLH)

A reinforcement schedule and spatial titration method were used to determine task-reinforcement area separation most preferred and effective in two third-grade boys. Errors in task performance decreased task-reinforcement area separation, while correct responses in task performance increased task-reinforcement area separation. (Author)

Describes several chemistry projects, including solubility, formula for magnesium oxide, dissociation of dinitrogen tetroxide, use of 1-chloro-2, 4-dinitrobenzene, migration of ions, heats of neutralizations, use of pocket calculators, sonic cleaning, oxidation states of manganese, and cell potentials. Includes an extract from Chemical Age on…

An attempt to impose Western values on Japan through the education system after World War II had no lasting success after the withdrawal of western occupation troops. (JD)

Describes an undergraduate experiment in which the structure of bis(2-ethylhexyl)phthalate (I) is analyzed and interpreted using Carbon-13 magnetic resonance. (MLH)