Shows how a simple investigation of the enzyme, thrombin, can provide a series of experiments giving information on enzyme characteristics. The results also provide a basis for discussion of the coagulation mechanism and related phenomena. (Author/AL)

Article describes how study of weather can be made interesting in classrooms. Individual and group investigations for students are suggested. (PS)

Short articles describe the construction and use of a probe for measuring magnetic fields, the determination of the speed of electromagnetic transmission by utilizing standard time signals relayed from an orbiting satellite, and an apparent paradox in the theory of electron deflection in cathode ray tubes. (AL)

Describes why and how science should be taught in the primary school, with particular illustrations for the first grade. Emphasis is given to helping children develop their rational powers, become acquainted with their environment, and develop their observational and descriptive skills. Children in the primary grades learn from manipulating actual…

Described are activities that are designed to help elementary children understand the possibility of the particle theory of matter. Children work with beads, marbles, B-B shot and sand; by mixing these materials and others they are led to see that it is highly possible for the existence of particles which are not visible. (BR)

Describes the construction of a battery-operated device which buzzes when a correct answer on a punched card is chosen. (CP)