Discusses the use of a new approach, rather than quantum mechanics, to obtain practical solutions to bond energy problems. Indicates that the complex nature of mathematics and the small magnitude of bond energies involved in an approximation are two practical impossibilities for quantum mechanics to reach simple, reliable results. (CC)

Discusses various control techniques used in chemical processes, including measuring devices, controller functions, control valves, and feedforward and feedback actions. Applications of control to a real chemical plant are exemplified. (CC)

Discusses ways in which children can learn by measuring a variety of common objects. (JR)

Describes an activity using simple materials that gives students an opportunity to express their ideas about possible extraterrestrial life forms. (JR)

Describes how student understanding and interest in the metric system system can be stimulated by building and launching model rockets. (JR)

Discusses the use of the "extent of reaction" in teaching freshman honors classes of elementary chemistry to provide students with a unifying concept in the treatment of stoichiometry. Four sample problems are included. (CC)

Discusses the case of DDT which can be introduced to nonscience students in a chemistry course, including the development of DDT, problems associated with its adverse effects, and curtailment of its use in our environments. (CC)

Describes several experiments, suitable for secondary school biology classes, using the bioluminescent marine bacterium, Achromobacter fischeri. (JR)

Reviews short term lunar surface changes gathered during the last decade and their relations to the seismic data from the four seismographs placed on the Moon. Indicates that such a continued consideration may give rise to a new insight into the structure of the Moon. (CC)