Relates how Charles Martin Hall discovered the method of making pure aluminum metal in 1886. Retraces the events and steps that led to the process of aluminum purification. Includes diagrams of the apparatus used in the investigations. (ML)

Describes 12 video films constituting the "What About" series of the Skills Essential to Learning project. Films begin with an introductory sequence showing a teenager using a particular science skill and concludes with a longer sequence showing a scientist using the same skill. Programs last 15 minutes and follow an identical format. (BC)