Presents a biochemistry laboratory experiment in enzymology using polyphenoloxidase or tyrosinase. (SL)

Using winter snow, kindergarten students can explore the properties of water. Students demonstrate melting, freezing, expansion, and evaporation through a number of activities involving a paper cup and a scoop of snow. Procedures and student reactions are described in detail by the teacher-author. (MA)

Presents an experimental method for introducing special relativity which utilizes the distinction between Doppler effects for sound and for light. (SL)

Describes a method of recording galvanometer deflections when using a d'Arsonval galvanometer to demonstrate forced, damped simple harmonic motion. (SL)

Describes the nine modules of the SAVI/SELPH program, a hands-on, multisensory science program developed for grade 4-7 visually impaired, orthopedically disabled, learning disabled, deaf, and multihandicapped students. Modules consist of measurement, structures of life, scientific reasoning, communication, magnetism and electricity, mixtures and…

Presents experiments using wild birds as predators and pastry as prey and colored stones as background to demonstrate natural selection. Describes the exercise as an exercise in simulating natural selection. (Author/CW)

Discusses the possibilities of toxins present in medicinal herbs. Describes an experiment in which toxic constituents can be selectively detected by thin-layer chromatography and NMR spectroscopy. (TW)

For the sake of grade school entrants in particular, nonexperimental science fair projects should be encouraged and accepted for science fairs. Support for this approach is given along with several suggestions for projects. Guidelines for judging nonexperimental projects are also included. (DH)

Offers a series of hands-on activities for introducing students to concepts of energy transfer and conversion. Describes how simple devices as marbles, ramps, and sliders can be used to gauge the transfer of energy and assist in the development of investigative skills. (ML)

Presents a novel approach to identification of unknown alcohols using experimental measurements of boiling point and viscosity which are easily obtained without expensive equipment of instrumentation. Provides instructions for preparing capillary viscometer, listing special hints for obtaining good results. (JM)

Recommends an experiment which will help students experience the physical evidence that floors, tables, and walls actually bend when pressure is exerted against them. Set-up includes: laser, radio, solar cell, and wall-mounted mirror. When the beam is moved by pressure on the wall, participants can "hear the wall bend." (DH)

Describes a laboratory investigation designed to analyze surface area to volume ratio related to cell division. Uses agar-gel "cells" with pH indicator added which are then "fed" acid for a measured time. Discusses procedures and materials used, providing a sample data table and important guiding questions. (JM)

Measurement of harmonic amplitude and phase response are discussed, focusing on an instrument used to demonstrate motion of a damped system when oscillating freely and motion of the same system when driven into harmonic oscillation. Includes procedures, sample results, and comparison of results to values calculated from geometry of the system. (JM)

Discusses two activities suitable for group involvement or demonstration purposes. The first focuses on factors which determine how much time an object (such as a ball) will take to fall to the ground from a certain height. The second concerns the nonconservation of volume when two soluble liquids are added together. (JN)