This article refers to a framework to teach the philosophy of science to prospective and in-service science teachers. This framework includes two components: a list of the main schools of twentieth-century philosophy of science (called "stages") and a list of their main theoretical ideas (called "strands"). In this paper, I show that two of these…

The discovery of the near isochrony of the simple pendulum offered the possibility of measuring time intervals more accurately than had been possible before. However,the fact that it was not strictly isochronous for all amplitudes remained a problem. The cycloidal pendulum provided this strict isochrony and, over a thirty year period from 1659 the…

The history of Balloon, which is enjoyed by most populations as ornaments and toys, is explained. The buoyancy of helium filled balloon has also helped many scientist in research work of chemistry.

This article argues that advances in nanotechnology in general, and lab-on-chip technology in particular, have the potential to benefit the developing world in its quest to control risks to human health and the environment. Based on the "risk society" thesis of Ulrich Beck, it is argued that the developed world must realign its science and…

An alternative method for the preparation of Pasteur pipet chromatography columns is presented that allows the column to be filled with solvent without bubbles and allows greater control of fluid flow while the materials to be separated are added. Students are required to wear gloves and goggles and caution should be used while handling glass…

This paper is predicated on the realization that a chemical hood is only one element of laboratory safety which encompasses a variety of other elements starting with the architectural design and layout of laboratories; through the installation, operation and maintenance of integrated electrical and mechanical systems; to the safety-mindedness of…

Describes numerous pieces of equipment for the chemistry laboratory. (MLH)

Brief descriptions of a number of new items (instruments, kits, collections, booklets) are given. Sources are indicated. (RH)

Descriptions of new equipment and materials are provided. Sources of the items are given. nRWH)

Described are a number of pieces of equipment including a sterilizer, microprojector, x-ray, centrifuge, vacuum pump, and incubator. (PEB)

Reports on the physical origins of spherical aberrations in axially symmetric electrostatic lenses to convey the essentials of electon optics to those who must think critically about the resolution of the electron microscope. (GS)