Presents eighteen selected chemistry notes which could be used in school chemistry courses. Each includes the name of the author and a description of activities suggested--a reading list is also presented. (HM)

Presents eight selected middle school science notes which could be used in school science courses. Each includes the name of the author and a description of activities suggested. (HM)

Describes a series of educational and entertaining demonstrations using liquid nitrogen. (CP)

Information concerning an undergraduate level experiment on the effects of surface forces is provided. (CP)

Describes an experiment for estimating molecular size and Avogadro's number. Uses the diffusion length of iodine in air at 100 degrees Celsius as a function of time, and the change in volume of a small quantity of carbon dioxide as it goes from the solid to the gaseous state. (GA)

Presents problems on the determinations of the maximum number of "monsters" which can inhabit Loch Ness and on the pH of pure water. (SL)

Presents four simple laboratory procedures for: preparation of organometallic compounds, a realistic qualitative organic analysis project, a computer program to plot potentiometric titration curves, and preparation of stereoscopic transparencies. (SL)

Describes an organic chemistry laboratory exercise which uses thermochromic compounds to study the thermodynamic effect of temperature on chemical equilbrium. (SL)

Letters from science educators on a variety of topics are presented. (CP)

Suggests a series of science activities in botany for the elementary school classroom. Contains suggestions on the care and propagation of the coleus plant. (CP)

Describes the apparatus and procedures for constructing simple AM radio circuits with a minimum of electronic components. (SL)

Describes the apparatus and procedures for conducting a simple speed of light experiment in an average laboratory using a laser source, a rotating mirror, and an oscilloscope. (SL)

Describes a series of polarography experiments using commercially available pulse polarography instruments. (SL)

Describes a laboratory procedure which does not demand sophisticated equipment. (CP)

Light-emitting diodes (LEDs) are described and three classroom experiments are given, one to prove the, low power requirements and efficiency of LEDs, an LED on-off detector circuit, and the third an LED photoelectric smoke detector. (BB)