Okay --- we know --- again with one of our favorite things --- free resources!!!! We cannot help ourselves --- like the SERC Library, this could be one of the best kept secrets around!!! Check out the The National Science Digital Library, http://nsdl.org/. The NSDL is a free online library for education and research in science, technology, engineering, and mathematics. The site was established by the National Science Foundation (NSF) in 2000 as a free online library which directs users to resources for STEM education and research. The site has content that is aggregated from a variety of other digital libraries, NSF-funded projects, publishers, and NSDL-reviewed web sites. The site is designed primarily for K-16 educators, however, anyone can access NSDL.org and search the library at no cost. Some content providers do require a nominal fee or subscription to retrieve their specific resources, however, there is a great deal of free resources!
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