Since 2005
ScienceBiz.com offers links to websites related to biochemistry, reliability engineering, chemist, morality, medical physics, mechanical engineering, earth sciences, materials, astrophysics, nuclear, software, molecular and much more.
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discuss physics, cosmology, thermodynamics, and mathematics.
http://www.physicsforums.com/
provides information about the #reefs chat channel, which hosts guest speaker meetings. Also offers a virtual library of articles and papers.
http://www.reefs.org/