Presents experiments that use a video cassette recorder (VCR) to demonstrate polarization of radio waves using two dipole antennas and a spark gap transmitter tuned to a frequency of either 60-66 MHz or 66-72 MHz with wavelengths of 5 or 4.3 meters, close to the wavelengths of the original work done by Heinrich Hertz. (JRH)

Presents an activity to simulate electrophoresis using everyday items. Uses adding machine paper to construct a set of DNA fingerprints that can be used to solve crime cases designed by students in any biology class. (JRH)

This activity involves elementary students in an investigation of the usefulness of plant parts as a food source. An introduction discusses the dependence of animal life on plants. Materials needed and step-by-step procedure are provided. (LZ)

Explains the properties of the Aborigine musical instrument, the bullroarer. Describes how to make one out of a wooden tongue depressor and dental floss. (MVL)

The authors present an exercise designed to help students overcome the misconception that most microbes make people sick. The activity helps students of all ages understand the important benefits of microbes such as in making bread, soy sauce, cheese, and wine. The role of microorganisms in processing cocoa and coffee and growing plants is also…

Presents a rock classification scheme for use by beginning students. The scheme is based on rock textures (glassy, crystalline, clastic, and organic framework) and observable structures (vesicles and graded bedding). Discusses problems in other rock classification schemes which may produce confusion, misidentification, and anxiety. (10 references)…

Describes how an integrated approach to scientific investigation was used to provide a better image of science to potential college students. (ZWH)

Describes seasonal activities that can be used to study the sedimentation process. (ZWH)

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 one simple rule to guide students in determining the number of significant figures in any value in science. (ZWH)

Provides protocols for the isolation and characterization of plasmid from E.coli. (ZWH)

The high points of the story of RNA are presented. The functions of RNA within the cell, how these functions are carried out, and how they evolved are described. The topics of splicing, self-splicing, RNA editing, transcription and translation, and antisense RNA are discussed. (KR)

Activities that use a common fluorescent light as a strobe light to make things appear to slow down, speed up, or stand still are presented. Background information on strobe lights and directions for the activities are provided. (KR)