Short articles describe the use of a lever to transfer energy between pucks on a frictionless surface, a demonstration of the principle of conservation of linear momentum, the construction of an inexpensive joulemeter, the design and construction of a simple logic demonstration board using integrated circuits, mounting of Geiger-counters to…

Short articles present ideas for demonstration equipment useful for the junior high school science: three-dimensional magnetic fields, model clocks, and smoke-ring puffers." (AL)

Describes the basic principles of setting up an aquarium and gives hints on its use as an instructional aid in elementary classrooms, both in generating biological questions and investigations and in its use in other parts of the science curriculum. (AL)