Provides description of an activity in which students synthesized sulfanilamide or sulfathiazole, II. The drug was then used as a chemotherapeutic agent. (RH)

Describes author's use of a three foot long tube, open at both ends, to exemplify that his highest falsetto note is lower than his lowest whistled note. (CC)

Describes experiments on flash photolysis and relaxation kinetics for college students using any standard photographic flash. List of experiments with explanations are included. (PS)

Experiments give students a practical awareness of pollution in its different forms. (RK)

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)