1. http://physics.stackexchange.com - Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free, no registration required.
2. http://www.principlehealthcare.com - Quick info about Vitamins & Minerals.
3. http://www.webmd.com - WebMD provides valuable health information, tools for managing your health, and support to those who seek information.
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