The mercury-drag effect is demonstrated when mercury vapor diffuses through nitrogen gas at low pressure, passing through tubes of different radii to liquid nitrogen-cooled cold traps. The pressure changes of the nitrogen gas on the mercury-deficient side of the cold traps are observed and compared with theoretical and experimental valves from the…

Concepts to be developed, objectives, and student instructions are provided for an activity useful as an introduction to or review of Mendelian genetics and sex determination. Universal codes (read by optical scanners at supermarket checkout stands) from soup can labels are used as chromosome maps during the activity. (JN)

The author suggests activities about simple food chains as a way of teaching elementary students concepts of energy needs, energy consumption, and energy transfer. (SJL)

The Animal Awareness club is designed to make humane education an integral part of the classroom. Reported is the format, evaluation, and follow-up materials for an animal awareness club. (Author/DS)

Suggests some nonfiction children's books and learning activities for the study of astronomy in the primary and upper elementary grades. (SJL)

Polyelectrolytes are discussed with regard to their importance to the undergraduate science major enrolled in a physical chemistry course. Suggests the importance of the solution behavior of polyelectrolytes to scientific disciplines and many industries. (Author/SA)

Provides ideas for involving fathers in a day care center along with samples of activities and experiments in science and mathematics and in a "Science and Math Fair." (MP)