Describes: (1) two experiments using a laser (resonant cavity for light and pinhole camera effect with a hologram); (2) optical differaction patterns displayed by microcomputer; and (3) automating the Hall effect (with comments on apparatus needed and computer program used); and (4) an elegant experiment in mechanical equilibrium. (JN)

Examines the current development of computer compact disk storage devices (CD-ROM). Describes the basics of how the CD-ROM operates and identifies educational uses. Lists companies currently providing CD-ROM software and producing CD-ROM players. (MVL)