Describes two computer simulation programs, "Nerve Physiology" and "Frog Heart," as practical alternatives to the use of live animals in class experiments. Discusses the potential of computer simulation as a feasible alternative to experiments with animals in the classroom laboratory. (CW)

Presents comments by classroom teachers on courseware for science teaching. Topics covered include astronomy, the heart, sound, geology, physiology, and glacial landforms. Specifications pertaining to equipment needed, availability, and cost are provided. (Author/RT)

This article describes a computer simulation of bacterial physiology during growth in a chemostat. The program was designed to help students to appreciate and understand the related effects of parameters which influence plasmid persistence in bacterial populations. (CW)