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NASA. National Aeronautics and Space Administration.
Science Accelerator. Documents from a wide variety of publication types, moderated by the Department of Energy.
Science Research: A free, publicly available deep web search
engine that uses advanced "federated search technology" to return high
quality results by submitting your search query - in real-time - to
other well respected search engines then collating, ranking and
dropping duplicates of the results.
Scitopia. Digital library of 21 leading science and technology societies.
Evaluating What You Find
What is it? Why do I care? What does it really say?
You answer these three questions every time you use a source, whether you know it or not. As you choose sources for everything from 1st-year courses to major-specific research courses to real life, notice how you answer these questions to ensure your sources are really meeting your needs.
Quick reference for the three questions:
What is it: What is the source type and author credibility?
Quick Wikipedia checks are okay!
Why do I care: Does the source type and author credibility meet your needs?
Decide this at the beginning so you know whether to investigate or find something better.
What does it really say: Perceive how the word choices influence the knowledge.
How slanted the word choice is can make a difference in how or why you would use it.