Describes three criteria for evaluating educational software; classification of software types, the presence or absence of process skills, and educational practices. This article provides background for a software evaluation form to appear in a subsequent issue. (CW)

Provided is an activity for student-constructed dichotomous keys that requires nothing more than a pile of shoes. Examples and directions are given. (MA)

Presented is a laboratory exercise that utilizes the natural yeast carbonation method of making homemade root beer to study fermentation and the effect of variables upon the fermentation process. There are photographs, a sample data sheet, and procedural hints included. (Author/MA)

Describes a method suitable for quantitative studies of plant water status conducted by high school or college students and the calculation of the relative water content (RWC) of a plant. Materials, methods, procedures, and results are discussed, with sample data figures provided. (CS)

Described are simulations that can be used to illustrate evolution by natural selection. Suggestions for simulating phenomena such as adaptive radiation, color match to background and vision of predators are offered. (BR)

A quick, simple method for preserving bird specimens using borax and a formalin solution is described. Procedures for injecting and mounting the specimens are given along with certain restrictions on preserving specimens. (MA)

This activity utilizes an overhead projector, a wax pencil, and a petri-dish to demonstrate the depth of field concept to students learning the use of the microscope. Illustrations and directions are included. (MA)

Presents experiments to introduce students to the phenomenon of biological rhythmicity and to reinforce the fact that there are differences in the physiology of human beings. (Author/MA)

Describes a laboratory experiment demonstrating the aldehyde oxidase activity in wild type and mutant fruit flies using a quantitative assay. The experiment can be performed in one hour. (MA)

An exercise designed to increase environmental awareness is presented. Procedures and materials are given for this sensitivity session, along with those for a contemplation exercise. Three approaches to environmental education are evaluated and the results are included. (MA)

The author explains how he uses the Audubon Christmas Bird Count to teach a laboratory exercise in vertebrate population dynamics. Problems and limitations associated with using these Christmas Counts are also enumerated. Graphs illustrate the material. (MA)

Discussed is the need for including Population Education in the classroom and lists several teacher resources. Many educational materials are described and include addresses and costs. (MA)

Discusses several of the plant responses to the environment and ways that these responses can be demonstrated. Includes phytochrome-controlled growth, phototropism, and geotropism. (CS)

Describes an exercise that teaches Mendelian inheritance using human traits which students find exciting and relevant. (LS)

Describes a simple method for extracting bacterial DNA for use in laboratory investigations to study genetic transformation in bacteria. (BR)