Simple Science Physics Philosophy Metaphysics
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.
http://www.spaceandmotion.com

Plasma Dictionary
Site listing several types of dictionaries related to the sciences.
http://www.alcwin.org/

Perspectives on Science & Technology
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".
http://www.units-of-measure.com/