Twenty-four preschool-age girls repeatedly experienced an initially novel episode in a laboratory setting. Each child's knowledge of the episode was assessed in an effort to examine the development of the children's scripts for a recurring event. (PCB)

Reviews the biological importance of the lipids categorized as waxes and describes some of the organic chemistry of these compounds. Presents a short laboratory exercise on the extraction of plant waxes and their analysis by thin layer chromatography. (Author/CCM)

Investigates procedural understanding of university students at the freshman level, prior to instruction, in the context of experimental work in physics. Proposes two types of reasoning used by students in the laboratory. Indicates a high degree of consistency of these modes of reasoning across experimental phases of data collection and…

Describes an inquiry-based science activity in which students investigate the preferred food sources of sowbugs. Students design their own experiment, perform a first trial, and refine their procedure before conducting a second trial with more accurate results. (SAH)

Describes a series of simple and nontraditional experiments that enable students to discover the properties of infrared radiation by studying the propagation, reflection, diffusion, and refraction of infrared. The experiments rely on two modules, an infrared transmitter and an infrared receiver. (SAH)

Presents an embryology laboratory observing the development of Ginkgo biloba's embryos into trees. Explains the methodology for the lab and discusses research questions. (YDS)

Presents an inquiry-based science laboratory examining the effects of alpha-melanocyte stimulating hormone (MSH) on skin pigmentation in the African clawed frog (Xenopus laevis). (YDS)

Describes a relevant, innovative laboratory exercise that promotes the construction of ideas that can be used to further science processing. Integrates technology in the form of digital photography, a portable computer, and a projection device. This activity fits well in a high school chemistry class. (SAH)

Describes an activity to give students experience with the variables and forces impacting a moving body on an inclined plane by observing a ball as it rolls down an inclined PVC pipe of fixed length. Includes a student worksheet. (MKR)

Discusses the problem of seizing cocaine-tainted money. Describes an experiment designed to determine what percentage of paper currency is contaminated with cocaine. Considers sampling, the analysis method, contamination, levels of cocaine in money and criminal activity, and the reliability of results. (SAH)

Explains the concept of stretch reflexes to students using a mechanical model. The model provides a dynamic multisensory experience using movement, light, and sound. Describes the construction design. (SAH)

Provides laboratory exercises that demonstrate two genetic concepts: the difference between a genetic selection and a genetic screening experiment, and the relationship between phenotype and genotype. (SAH)

Describes a paternity simulation experiment with two situations. Uses ABO blood group analysis and horizontal agarose electrophoresis to identify the biological fathers. (YDS)

Explains the limitations of a traditional density experiment and presents an inquiry-based laboratory experiment which allows students to develop an understanding on the relationship between the object's properties and the volume of water the object displaces. (YDS)