Describes activity relating to the study of trees. (SL)

Presented is an activity in which students use a microscope to do a forensic hair comparative study and a medullary classification. Mounting methods, medulla types, hair photographs, and activities are described. (DS)

Several activities related to color are discussed. These include placing different colors on a disk which, while spinning, appears to be white. Also discusses complementary and primary colors. (JN)

Describes a lab investigation designed to introduce students to soil compaction and help them to learn to design and adapt procedures that scientists use when they plan and conduct controlled investigations. Provided are objectives, a list of materials, procedures, and a sample student handout. (CW)

Describes a secondary project in which students must organize an expedition to settle the people of the Earth on a new planet. (MLH)

Describes the chemical reactions and compounds involved in making a cake. A protein coagulation and gas expansion laboratory activity is included in which the students bake a cake and eat it. (DS)

Explained are the differences between and offered are examples of longitudinal and transverse sound waves. Described is the construction of the Crova's Disc, a device used in the teaching of the propagation and properties of sound waves. (DS)

Provides a set of plans for constructing a plant incubator for the classroom. Illustrations are provided as well as lists of materials and tips for rearing the plants. (SA)

Introduces a construction method for a bubble made of polyurethane plastic and its applications in an ecology classroom. Provides the materials list, directions for bubble construction, and classroom activities. (YP)

Described is a science experiment involving the isolation and study of microorganisms. Bacteria from the mouth are cultured on blood agar culture plates and are then exposed to four different mouthwashes to test their effectiveness. (DS)

Uses a vortex device as a model to study low-pressure systems and other related investigations. (LS)

Unusual experiments in sound are described. Sounds produced from the vibration of areas are represented by many beautiful sand patterns. The vibrating areas vary from square to circular plates. (SA)

Several science activities are provided for use with middle and high school students to aid in their understanding of chirality (left and right handedness). (ZWH)

Presents an activity that models the changes in the concentration of carbon dioxide gas in the atmosphere during the last 200 years as determined from glacial records. (PR)

Presents an investigative sequence of experiments addressed to the topic of photosynthesis. (BR)