Describes the insertion reaction using the insertion of carbenes into carbon-hydrogen bonds as an example. Outlines an experiment that will illustrate dihalocarbene insertions into diisopropyl ether. (GS)

Describes an activity designed to introduce concepts of randomness and standard deviation. (CP)

Examines relative effectiveness of four types of relaxation training including Jacobson-Wolpe and electromyograph (EMG) feedback. Dependent measures are EMG recordings and self-report measures of relaxation. All groups reported increased relaxation, but EMG groups were superior in EMG measures of speed of learning and depth of relaxation.…

A discussion of the centrality of the need for and a commitment to the concept of heterogeneous grouping as the basis for open educational alternatives, aimed at supporting each and every child's development by valuing his educability, potentiality, and the positive connotations of difference. (EH)

Describes the procedures in growing thymol crystals and suggests eight activities which can be carried out by students in examining crystals. (BR)

A report of the growth and present status of the mini-computer based, time sharing laboratory at the University of Indiana, which describes the system hardware, software, and applications in psychological experimentation. (EH)

Describes how astrophysics can be a do-it-yourself project within a school boy's budget and background, by giving detailed instruction on equipment construction. In addition, this article describes many experiments to undertake, with the equipment, such as determining color temperature, star spectra, chemical composition and others. (BR)

Describes a set of experiments for the catalytic oxidation of alkenes to aldehydes and ketones which can be carried out in a test tube by the student. (BR)

Describes construction of a pinhole camera with simple materials and five experiments to be conducted, as well as instructions in creating a working camera obscura. (BR)

Illustrates some important characteristics of photosynthesis, concentration dependencies of reaction rates, temperature effects, and effects of changes in actinic wavelength. (GS)

Criticizes the philosophy and management of several research projects of the 1960's. The procedures employed by second language learners unconstrained by group arrangements, teacher presentation, or other major interventions in their learning opportunity need to be studied. Only then can a theory of second language learning be constructed.…

Weights suspended from a lever arm separate evacuated hemispheres allowing estimation of atmospheric pressure to within five percent of the barometric reading. An illustration and a reference to von Guericke's demonstration are provided. (GH)