Discussed are ways in which the slide rule can illustrate a number of mathematical functions and concepts. Fundamental operations and visual advantages are reviewed. (CS)

Describes the construction and use of a star projector built from an overhead projector and high-impact polystyrene plastic. Includes patterns for the star charts and the projector frame. (MA)

Students often have difficulty relating contour lines to the shape of a landform. This article describes the construction of a simple landform model designed to help students better understand contour lines. (MA)

This article is a reproducible page for students in grades four through six. The stated objective is the student will organize information about unfamiliar animals and infer other information. Students read clues about five newly discovered species and use a chart to organize this information in a more meaningful way. (PR)

Describes class projects involving astronomical photography. Includes a description of how to make an astrocamera or convert a pocket camera into one suitable for astrophotography, film choices, and phenomena to photograph, such as star trails, meteors, the sun, and the moon. (DS)