NSDL provides quality digital resources and services to the science, technology, engineering, and mathematics (STEM) education community, both formal and informal, institutional and individual. NSDL is a multi-institutional collaborative with partnerships from an extensive network of academic, business, government, and other organizations. Resources available through NSDL include images, video, audio, animations, software, datasets, and text documents such as lesson plans, activities, journal articles, and more. In addition, NSDL provides search, browse, help, blogging, collaborative workspaces, collection creation and management services, news reports, and online community discussions. Use of the NSDL.org website and related search and reference services is completely free, as are the majority of the resources discoverable through NSDL. However, some resource providers who make their materials accessible through NSDL do require a login, or a fee-based membership or that users purchase the complete version of a resource.

Please note that this resource requires Flash, or Java Applet Plug-in.