ActaPhysica - Free social networking platform for the physics community, enables users to network with peers in the worldwide physics community and share knowledge, ideas, problems and resources..
Advanced Physics Forums - Intended primarily for physics majors, graduate students, postdocs and faculty. Get meeting information, theoretical and research information and exchange of ideas. Meant for the physics community throughout the world..
Physics Forums - Bulletin boards on physics and related subjects. Includes related polls and a list of active threads..
PhysOrg Discussion Forum - Applied physics, nanotechnology, quantum physics, and semiconductor technology. Also discussions of the latest physics news..
QuantumBrain - Collaboration between a neuroscientist based at the University of Oxford and a quantum physicist based at the University of Queensland. Includes blogs and philosophical musings..
Scott Watson's Physics FAQs - A list of FAQs (Frequently Asked Questions) regarding Cosmology, String theory, Relativity and General Physics.
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