Presents a program that provides a structured listing of BASIC computer programs in a text file. Indents for-next loops for better appearance and easier understanding. Lists program and provides for several versions of BASIC. (MVL)

Demonstrates the magnitude of an extinction event by using a simulation to illustrate the massive nature of the loss of a family and the number of species that perish to achieve that result. (RT)

Outlines procedures for demonstrating and preparing a permanent slide of sister chromatid exchanges and recombination events between the two chromatids of a single chromosome. Provides the name of an additional resource for making preparations of exchanges. (RT)

High school students discuss the process of conducting original scientific research in a high school biology course, including developing an idea, obtaining financial support, collecting data, and presenting findings. (MKR)

Describes a laboratory method to allow students to complete electrophoresis and staining of DNA samples within 1 45-minute classroom period. (MKR)

Describes how a simple radio homing device can be used to allow students to participate in a search and rescue mission similar to that which the Civil Air Patrol engages in when locating planes that have crashed. (ZWH)

Describes various demonstrations that illustrate double refraction and rotation of the plane of polarization in stressed, transparent plastics, with the consequent production of colored designs. (ZWH)

Describes an experiment designed to help understand the effect of the curvature of the laboratory equipment support (cylindrical rod instead of knife-edge) on the frequency of oscillation of pendula. (ZWH)

Presents a history of science education reforms since World War II. (Author/MKR)

Presents an activity in which students draw the decay curve for a medical radioisotope and determine its half-life. (MKR)

Describes fluids whose viscosity is affected by electric fields. (PR)

Presents an activity that enables students to answer for themselves the question of how fast a body must travel before the nonrelativistic expression must be replaced with the correct relativistic expression by deciding on the accuracy required in describing the kinetic energy of a body. (ZWH)

Describes an approach for teaching with analogies in secondary science classes and gives an example using the three states of matter. (14 references) (Author/MKR)