Learn all about gears. Read articles on different kinds of gears and gear technology.

Quiz site for physicians, medical residents, interns, and students to help study for board exams and maintain their current knowledge. all services are free and our community also offers a blog, current news, and useful information for all medical professionals.

Metric conversion tables to help you convert between different units of measurement using the metric system, british/american, avoirdupois systems, etc.

A website with a database of information on a variety of units of measure. Look for new perspectives on the magnitude of any physical quantity. Contribute your own unique "Perspective Block".

The discrete particle conception of matter in space causes many problems. By describing reality in terms of one thing existing, Space, with properties of a wave medium, the wave structure of matter explains and solves numerous problems of Science.

This site is an information resource for laser device and component manufacturers, machine

integrators, contract manufacturing job shops, researchers and academics.

Unofficial ITER fan club is a community of people interested in International Thermonuclear Experimental Reactor and its benefits to science, technology, industry and all humankind. We keep track of news, links and publications about ITER and fusion energy in general.