Describes use of video equipment to record laboratory experiments which can then be replayed for closer analysis of results. (PS)

A practical magnetotropism experiment with seeds is presented. The procedures, needed controls, and observations of results are described. (DF)

Through the use of discrepant events, children can be challenged at a variety of levels to become successful investigators. (PS)

Describes an experiment which can be used to provide an introduction to study of reaction mechanisms and training in use of simple analytical and instrumental techniques. (PS)

The ratio of electronic charge to Boltzmann's constant can be easily determined by measuring the short-circuit collector current versus the emitter-base voltage characteristic of a silicon transistor connected in the common-base mode. (Author/DF)

A device which provides an inexpensive means for making precise studies of the kinetics of gas molecules is discussed. Two experiments are described: (1) Measurement of the vibrational relaxation time of gas molecules and (2) determination of intermolecular forces in molecules. (Author/DF)