Describes how the electron-pair repulsion model qualitatively explains the size and shape of molecular orbitals. Briefly discusses trigonal bipyramidal molecules, three-center bonds, and transition elements. Describes cluster compounds and finishes with a discussion of the exceptions to the model and effects of ligand-ligand repulsions. (RR)

Describes the problems facing two-year community colleges in teaching physics to nonphysics majors. Describes the open laboratory and individualized instruction at Florissant Valley Community College. Discusses what the author considers the greatest need in physics education, a set of objectives of instruction for all courses at all levels. (RR)

Presents the two positions of the geological debate, as presented in 1796, between the Wernerians (uniformitarians) and the Huttonians (catastrophic supporters). Presentations stress importance of earth heat, the origin of granite and basalt, and the cyclic theme of Hutton's earth. (RR)

Describes an experiment in which the Fresnel diffraction pattern of a single slit can be displayed directly on an oscilloscope. The experiment requires a minimum amount of equipment and space. Results of the experiment are presented and compared with theoretical calculations carried out by a digital computer. (LC)

College physics textbooks emphasize the conclusions of research at the expense of the context of inquiry in physics. The latter should be given specific consideration in at least one of the student's physics courses. An excellent focus for this consideration would be the process of theory evaluation as indicated in this paper. (Author/TS)

Although there were no differences in pretest scores, students with a background in high school agriculture courses achieved lower scores on tests in college biology than those without this experience. The supposed relationships between biology and agriculture courses are questioned. (AL)