Explains the separation of the constituents of mixtures on one piece of chromatography paper. The example presented involves a vitamin C tablet, a disprin tablet, and a glucose tablet. Outlined are two methods for separating the constituents. (GS)

National Science Teachers Association (NSTA), led by a panel of K-12 science teachers, has developed a new position statement, "Responsible Use of Live Animals and Dissection in the Science Classroom." This statement examines the issues surrounding the integration of animals into the K-12 science curriculum and highlights key…

The advantages are related of a video recorder over a Polaroid camera for doing experiments dealing with the "conservation of mass and momentum." Use of video records is advocated for recording measurements in physics experiments. (JP)

Evaluates the arsenite-modified Jacobs-Hochheiser procedure for determining integrated nitrogen dioxide and nitrous oxide levels in the 1-15 pphm range in indoor and outdoor environments. (JR)

Worksheets utilize a paper geoboard to provide a variety of experiences with basic geometric concepts. (JP)

Briefly outlines the theoretical basis of the phenomenon of photoconductivity and describes a simple experiment which demonstrates the photoconductive properties of cadmium sulfide. (JR)

Discusses the vicious circle of perpetuating traditional practices in the use of laboratory organisms. Makes a plea for biology teachers to use new organisms for new tasks, indigenous organisms rather than imported ones, living organisms rather than dead, and organisms to explicate principles rather than as sources of stultifying detail. (JR)

Activities are described that involve polyhedrons constructed with a marble inside enabling them to roll across a smooth surface. Directions are given for constructing such a tetrahedron. (DT)

Lists of materials for a mathematics laboratory and some suggestions for activities are given. (DT)