The National Science Foundation (NSF) offers an online collection of lessons and Web resources, most of which come from the National Science Digital Library (NSDL).
The resource materials are arranged by subject area: Arctic & Antarctic, Astronomy & Space, Biology, Chemistry & Materials, Computing, Earth & Environment, Education, Engineering, Mathematics, Nanoscience, People & Society, and Physics. Each subject area includes an overview of NSF research, in both interactive and text-only versions. The materials can be found online at http://www.nsf.gov/news/classroom/.
The National Science Digital Library is the NSF's online library of resources for science, technology, engineering, and mathematics education. The NSDL materials are created by collaborating partner institutions, including universities, museums, professional organizations, government agencies, research laboratories, and publishers.
National Science Foundation, 703/292-5111 or http://www.nsf.gov/.
National Science Digital Library, http://www.nsdl.org/.