NSDL is the Nation's online library for education and research in
Science, Technology, Engineering, Mathematics. Follow the "Resources for K-12 Teachers" link (http://nsdl.org/resources_for/k12_teachers/) and then click "Middle School."
"Science.gov searches over 42 databases and over 2000 selected websites from 14 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results."
Science-related videos from Wired Magazine and PBS: "Each week, WIRED Science correspondents take viewers to the frontiers of discovery across the country and around the world, spotlighting the cutting-edge innovations and research that are defining 21st-century culture, and introducing the high-tech mavericks who are making it happen."