Provides information for the classroom teacher on the historical background, nature, and control of water pollution. (LS)

Describes new film catalogs, instructional materials, equipment, and development in a variety of science areas. Outlines the National Science Foundation reorganization, the National Science Board policy statements, and recent National Science Teachers Association actions. (GS)

Describes easily constructed "black box" activities designed to introduce students to the concept of a scientific model. Exposes students to the scientific method of research and to the multiple models which can be hypothesized for many phenomena. (CP)

Reviews Piaget's stages of development and describes types of educational activities which are appropriate for specific levels of cognitive development. (CP)

Cites evidence to support the theory that the world food shortage will become a chronic condition. Describes the depletion of surplus food supplies and the increasing dependence on North America for food supplies. (MLH)

Chemical nomenclature for both organic and inorganic chemicals are discussed. (RWH)

Discusses the major constituents present in natural bodies of water, how these substances are analytically determined, and the chemical reactions of the various species in solution. (MLH)

Describes a student research project on the human head louse. (BR)

Describes a classroom activity which involved sixth grade students in a learning situation including making ice cream, safety procedures in a science laboratory, calibrating a thermometer, using metric units of volume and mass. (EB)

Presents an introductory activity in the use of arbitrary measuring units, using simple materials found in school or at home. Materials are listed and activities provided. (EB)

Describes a method used to introduce the metric system to five year olds. Suggestions and necessary materials are included. (EB)