Describes a student research project on the human head louse. (BR)

Describes an experiment that results in the construction of an ecological pyramid with three tropic levels. (GS)

Describes an experiment that generates data for calculating the ratio of molecular separation in a gas to molecular diameter. (GS)

Describes a classroom activity which involved sixth grade students in a learning situation including making ice cream, safety procedures in a science laboratory, calibrating a thermometer, using metric units of volume and mass. (EB)

Describes a project in the United Kingdom designed to produce materials for methods courses. (BR)

Describes a variety of experiments and activities such as refractive index by an interference method, Young's third slit, a microscope problem, uses of a hand stroboscope, an acceleration game, an aluminum thermometer, why milk boils over, and others. (BR)

Describes a method for the preparation of hydrogen gas which is safer than conventional procedures. The procedure and equipment are described in detail. (BR)

Describes laboratory exercises with chickens selecting their food from dyed and natural corn kernels as a method of demonstrating natural selection. The procedure is based on the fact that organisms that blend into their surroundings escape predation. (BR)

Describes a demonstration with mothballs that simulates the ballast mechanism of a fish air bladder. (BR)