Describes the macroscopic process of the swelling of clay by adding water, and the corresponding microscopic process of water molecules entering the spacings between clay crystals. Discusses how the Bragg equation can be used together with other physical data to calculate these spacings. (MLH)

Presented is an idea for combining popular hobby interest with the big ideas of science. Suggestions are presented and detailed directions given for terrarium building. (EB)

An undergraduate experiment is described which employs a relaxation method for the measurement of the thermal conductivity and specific heat of a metallic sample in a temperature range of 0-100 degrees centigrade. (Author/CP)

Instructions are provided for the construction of 4.5 foot diameter planetarium shells. (CP)

Describes a rocket propulsion demonstration utilizing a child's wagon and a carbon dioxide fire extinguisher. (CP)

Describes the separation of proteins from bovine serum and egg-white using carboxymethyl cellulose, Vistec C1. Explains the preparative work that is essential before the technique can be employed. (GS)

Describes how to play "Periodic Creep," a chemistry game in which the periodic table is the board. (LS)

Describes a game in which students practice process skills in the science classroom. (LS)

Describes a collision probability demonstration that emphasizes the value of behavior which minimizes traffic randomness. (LS)

Describes a game in which elementary school students learn the importance of plants and some techniques of plant identification. (LS)

Describes a series of literature problems integrated into organic and biochemistry courses which direct students to seek specific information from specific sources. (GS)

Explains the educational value of computer simulations in general and provides specific areas of computer application in teaching of chemistry, biology, and physics. Explains the application of instructional materials developed in the Chelsea Science Simulation Project. (GS)

Describes elementary school activities in which the students learn to associate the length of a shadow cast by an object with the position of the sun in the sky, thus allowing the students to form an operational definition of high noon. (MLH)