Presents notion that low science enrollments in high schools are partially related to the severity of grading practices used by science teachers. A model is discussed which assumes that students compare the science grades with grades received in other subjects. Research methodology is suggested. (PS)

Short articles describe techniques for demonstrating corrosion of metallic couples, colloidal dispersion of light, the biodegradability of detergents, the laboratory preparation of chlorine in model electrolytic cells, and the detection of food colorings in candy. (AL)

Short articles describe techniques suitable for junior high school science, including the use of a toy drinking bird" to start discussion, using cobalt chloride solution to demonstrate convection currents, demonstration of the relationship between freezing point and concentration, and instructions for building a simple lens camera, a circuit…

Outlines changes in the relative importance of technological Applications in selection of science course content. Argues that present lack of such examples may be disadvantageous. (AL)

An experiment is described to determine the horsepower rating of students running up a flight of stairs. (DF)

Describes an approach to teaching the Hardy-Weinberg Law in high school genetics class. Instructional procedures used help in developing this concept in broad generalization form rather than merely a mathematical model of a gene pool. (PS)

Describes the results of a study of the ecology of the bean plant/aphid/ant/associated insects/fungi system and suggests a series of experiments that secondary school students could undertake by observing or manipulating this system. (Species recorded are British) (AL)

Discusses the advantages of using reptiles in biology and elementary school classes, describes demonstration techniques used by the author, and suggests some student activities using reptiles, especially snakes and lizards. (AL)