Describes a model that illustrates the operation of principles of adaptive radiation. The model used is constructed of materials that can be easily obtained. Suggestions for use are provided. (PS)

Describes a unit of study of microorganisms employed with great success by over 100 teachers. The guide is a laboratory manual containing no prodedures or instructions. Only a brief problem statement is included. The student is the researcher and works out his own questions, procedures, results, and observations. (DF)

A science program was developed which is based on a mobile laboratory containing scientific experiments in biology, chemistry, physics, applied science, and mathematics. Discussion and experiments differ from the normal classroom setting as they utilize small groups and center around the relationship of modern science and technology of the urban…

Describes a high school biology program based on student investigations. The comparative study of different topics in plants and animals is stressed. First phase of the course centers around relationships between the ecosphere and the individual; the second phase considers the molecules and the individual. (PS)

Commercial advertisements in publications can suggest numerous topics for student investigations. Students can gain research experience by devising experiments for testing products. (PS)

Describes various activities to understand the nature of the earth as a spaceship and its impact on human life. A figure depicting a holocoenotic environmental complex is given which can be used to illustrate various interacting forces on earth. (PS)

Describes an indirect laboratory method of calculating pi by using circular aluminum foil pieces as reactants with sodium hydorxide solution in a eudiometer, and indicates the presence of errors ranging from +0.05 percent of 3.1416 to +0.5 percent of 3.142. (CC)

Applications of wheels are shown to be an invaluable tool in teaching the processes and technology of science. (DF)

Many experiments can be conducted in spring and early summer when many of the flowering plants must hurriedly bloom before the leafage of the trees and bushes takes most of the needed sunlight away. (DF)

A small pond in a schoolyard provided year-round biological activities for children. As seasons changed, concepts and life relations also changed. Besides microscopic organisms in water, children learned about microscopic algae, detritus, and food chains. Concepts of predator-prey relationships and of ecosystems were successfully developed. (PS)