"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."
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."
"The Digital Library for Earth System Education (DLESE) is a distributed community effort involving educators, students, and scientists working together to improve the quality, quantity, and efficiency of teaching and learning about the Earth system at all levels." The site includes etensive Educational Resources and Earth Science Literacy Maps, and allows you to narrow your search by Grade Level, Resource Type, Collections, and Standards.
" A guide to commonly encountered toxic chemicals, environmental health risks, and the public's health. From the US National Library of Medicine." Interactive!
Topics related to the environment along with ideas and resources for environmental activism. The site is no longer updated but the site still includes many useful links.
"Tables charting the chemical elements have been around since the 19th century - but this modern version has a short video about each one.
We've done all 118 - but our job's not finished. Now we're updating all the videos with new stories, better samples and bigger experiments.
Plus we're making films about other areas of chemistry, latest news and occasional adventures away from the lab.
Most recently we've started a new series - The Molecular Videos - featuring our favourite molecules and compounds."
"The Encyclopedia of Life is an unprecedented global partnership between the scientific community and the general public. Our goal is to make freely available to anyone knowledge about all the world's organisms. Anybody can register as an EOL member and add text, images, videos, comments or tags to EOL pages. Expert curators ensure quality of the core collection by authenticating materials submitted by diverse projects and individual contributors. Together we can make EOL the best, most comprehensive source for biodiversity information."