Describes an activity that allows students to use a rectifier circuit to convert alternating current into direct current. Also informs teachers of how to obtain most of the equipment needed for free. (ZWH)

A short history of Newton's work in optics, mathematics, and astronomy. (BB)

Presents a brief introduction of our atmosphere, a guide to reading and interpreting weather maps, and a set of activities to facilitate teachers in helping to enhance student understanding of the Earth's atmosphere. (ZWH)

Describes an activity that makes learning about cells and cell structures more fun. Students are asked to create a board game that teaches others about cells and their structures. (ZWH)

Presents three lapidary activities which have been developed to teach enrichment courses to adults and young people. Described are activities and materials for polishing and shaping rocks. (EB)

Describes how teachers and students can construct a mass, spring scale, lever, and pulley. (ZWH)

Uses diagrams and text to describe four activities involving trees designed to aid students in better understanding responses to seasonal changes (ZWH)

Provides a brief account of the discovery and theory of antimatter and describes several activities relevant to the study of antimatter on the secondary level. (MLH)

This elementary school science project involves making a car out of pegboard, spools, rubber bands, and dowel. (BB)

Described is the observation of the moon with binoculars. Descriptions of the thin crescent moon, three-day-old moon, five-day-old moon, first quarter moon, 10-day-old moon and the full moon are presented and characteristics of each phase are included. (DS)

Describes a simple and inexpensive way to construct two small growth chambers for studying phototropism in the science classroom. One chamber is designed to illustrate how plants grow around obstacles to reach light and the other to illustrate directional light responses. (HM)

Describes procedures that students can follow to develop latent prints. An introduction of chemistry of latent prints is also presented. (HM)

Discusses how a science teacher can explain to his youngsters what happens when an ice cube is added to tap water or other liquids. How long melting a standard ice cube takes is also discussed. (HM)

Describes an approach to teaching animal classification by applying a scientific examination of the types and arrangement of the teeth. This approach may be used by high school students. (HM)