A simple analog computer program is described which, in conjunction with a dual-trace storage oscilloscope, can demonstrate travelling and standing waves, the effect of various reflection coefficients, standing wave ratios, and other wave phenomena. (Author/CP)

Describes a project done to verify or dispute the breakdown in litter content proposed by Keep America Beautiful, Inc. (KAB). Decisions made relating to quantity of materials, area to be studied, and a complete description of the project are given. (EB)

A learning activity is described in which the children become involved in dialogs with the Earth and its resources, and in turn the eye reads the surroundings and becomes more skilled at observation. (EB)

A field trip for identifying and collecting wild edible plants is described. (BB)

Discusses briefly Piaget's views on intellectual development as related to science teaching. Describes intellectual activities observed in science classrooms and shows how specific science lessons can be designed to encourage cognitive development. (GA)

Three questions guided an evaluation of sixth and eighth grade science enrichment activities: (1) Does a free choice interactive program affect cognitive abilities? (2) Do students in a free choice program make predictable selections of activities based on their age, sex, or ability level? and (3) Are specific student choices associated with…

The demonstrations and experiments described in this article are appropriate for junior high school and older students, including beginning students in college biology or botany. Included are culture and observation of zoospores, zoospore attraction to plant roots, and other topics. (BB)

The use of environmental meters designed to measure conductivity, light level, oxygen, pH, sound, and temperature are discussed. Criteria for choosing suitable equipment are suggested and, where possible, cheaper alternatives are mentioned. (Author/BB)

Presents the following chemistry lecture demonstrations and experiments: (1) a versatile kinetic demonstration; (2) the Bakelite Demonstration; (3) applying Beer's law; and (4) entropy calculations. (HM)

Presents a formulations laboratory project in which secondary school students attempt to prepare a common household product from laboratory chemicals. (HM)

Describes activities for earth science students from grades 7 and 8. Game questions, rules, and game boards are included for two folder funs. (MA)

Presents two experiments concerned with mapping skills. Directions are given for calculating the circumference of the earth and for developing a model of the solar system using familiar territory as a frame of reference. (MA)

Students often have difficulty relating contour lines to the shape of a landform. This article describes the construction of a simple landform model designed to help students better understand contour lines. (MA)

Presents a classroom activity which can be used both to assess student's modes of thought and to clarify the logic of hypothesis testing. The task is based on Piaget's theories of cognitive development. (HM)

The use of basic oceanography equipment in junior high and senior high school science applications is described. (CP)