Activities that use dandelions to show the phenomena of geotropism and autotropism are described. Directions for collecting the stalks and observing the gravitropic response are included. The topics of lag time and bending rates, autotropism, growth rate changes, presentation time, and gravity detection are discussed. (KR)

Discusses the principles of magnetic levitation presented in the physics classroom and applied to transportation systems. Topics discussed include three classroom demonstrations to illustrate magnetic levitation, the concept of eddy currents, lift and drag forces on a moving magnet, magnetic levitation vehicles, levitation with permanent magnets…

The function of self-injurious behavior (SIB) by an adult with severe mental retardation was analyzed via descriptive and experimental analysis methodologies. Results indicated that SIB occurred more often when the participant was presented with nonpreferred novel activities. Intervention resulted in the use of negation to terminate the…

Uses a projector, a prism, and two screens to demonstrate the composition of white light and detect color. (MDH)

Presents two experiments in which students examine the effects of touching and shaking on plant growth in common bush beans. (MDH)

Provided is an outline of laboratory activities involving a full year of student investigations of natural-resource ecology and an example of an activity, "Home Range Analysis." Objectives, background information, key vocabulary, skills, materials, procedures, extension activities, and evaluation of this three-lesson activity are discussed. (CW)

Included are three demonstrations that include the phase change of ice when under pressure, viscoelasticity and colloid systems, and flame tests for metal ions. The materials, procedures, probable results, and applications to real life situations are included. (KR)

Explains the importance of introductory science courses and presents characteristics of exemplary courses. (PR)

Describes a simple and inexpensive, one-period activity to extract DNA to make the study of DNA less abstract. A microscope titration is used to determine when cells are ready for DNA extraction. (PR)

Describes an interesting field experiment examining the distribution and diversity of a single community using lichens and the animals living in them. Combining field experience and laboratory work reveals not only the biology of some unusual organisms, but also community ecology and diversity. (PR)

Presents an activity in which students investigate the formation of solid ammonium chloride aerosol particles to help students better understand the concept of acid rain. Provides activity objectives, procedures, sample data, clean-up instructions, and questions and answers to help interpret the data. (MDH)

Proposes as a unifying theme for high school biology the question of "how chromosomes determine what we are." Describes a sequence of lessons in which students learn about proteins, enzymes, and amino acids. Includes three dry laboratory exercises to demonstrate the DNA sequences for sickle cell anemia and cystic fibrosis. (MDH)

Describes the use of Vee maps in helping students understand scientific investigations. (PR)

Describes an easy and inexpensive method of preparing experimental growth media that high school students can use for plant cloning investigations. (PR)

Describes the implementation of the National Aeronautics and Space Administration SEEDS Project in a sixth-grade class in Turlock, California. Describes student activities and media coverage surrounding the project. (MDH)