Explore, Share, Learn, Create.
"NSDL is the National Science Foundation's online library of resources and collections for science, technology, engineering, and mathematics education and research."
Resources include images, video, audio, animations, software, datasets, and text documents such as lesson plans and journal articles. (Some content requires a login to view complete versions, but most seem to be free.)
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digital library, science, math, NSDL,
