An activity that can be used to teach plant nutrition and the use of hydroponics is presented. Materials and procedures are discussed. Possible topics for science projects are suggested. (CW)

Reviewed are the features of lasers that make them useful to chemists and in chemistry curricula. Types of lasers are listed. Laser-induced fluorescence experiments are discussed. (CW)

Reviewed are the basic concepts of experimental design, analysis of data, and optimization. Discussed are two-level factorial designs; fractional factorial designs and blocking, additive, linear, and quadratic models; quadratic and composite designs; and designing experiments in design. (CW)

Discusses advantages of the Stirling engine. Describes the details of constructing one from common materials, and its use for studying thermodynamics. (YP)

Described is an experiment designed to illustrate photosynthesis. The experiment is based on a classic experiment performed by vanHelmont in the sixteenth century. A list of materials, procedures, and concepts are discussed. Variations are suggested. (CW)

Discusses the use of an individually designed experiment for a chemical engineering laboratory course. Lists main ideas of the method. Provides an example of the experiment including ways to answer the questions and extensions. (YP)

Describes experimental procedures to produce magnetic fields with a thermocouple. Provides diagrams showing the apparatus, tables of experiment data, and background information on the theory. (YP)

Describes an aircart upon which a person can sit. Discusses the construction and use of it in a physics class. (YP)

Presented is an activity in which the composition of margarine is analyzed. Materials and procedures are discussed. An extension activity on emulsions is suggested. Background information on the history of margarine is provided. (CW)

Discusses a group project for a physics laboratory using various pendulums. Presents diagrams of pendulums, describes how to make a pendulum, and provides suggestions for guiding students in the laboratory. (YP)

Describes three experiments with an air table to produce a centripetal force. Provides some diagrams and pictures of the apparatus. (YP)

Described are two investigations carried out in a high school biology department using a domestic microwave oven to compare the relative attributes of the autoclave and microwave oven in school use. Discussed are equipment, methods, and results of each investigation. (Author/CW)

Described is a simple, safe, and inexpensive experiment which allows secondary school pupils to observe how fungi and bacteria grow and interact with each other. Included are discussions of materials, methods, observations, and a historical comment. (Author/CW)

Introduced are two experiments: radon detection method shows real data using vacuum cleaner, soft toilet paper, and Geiger-Muller tube; critical potentials measurement describes the operation of Teltron tube with VELA. (YP)

Described is a physical pendulum experiment with variable pivot as an example of maximizing computer benefits in laboratory interfacing. The laboratory procedures using spreadsheet graphics package are discussed. A diagram of the pendulum, basic formulas, and theoretical curve is provided. (YP)