At this web site you will find diagnostic instructional tools for middle and high school teachers and students. These tools, which include web-served assessments, are aligned with National Standards and Benchmarks in science and mathematics. Resources in this project have been developed and tested by teachers and are based on research into the teaching and learning of math and science.
"This is a newly revised 3 minute HD dramatic video choreographed to powerful music, which introduces the viewer to the wonder and miracle of cells. It is designed as a motivational "trailer" to be shown by Biology, Biochemistry and Life Science teachers in middle and high school and college as a visual "Introduction" to this amazing microscopic world."
Blog post of links to several good periodic tables. Useful for chemistry students and for middle school students doing research on elements. Some interactive. Some with videos.
California's Tech Museum of Innovation: engineering-design lab lesson plans, uses available materials and explores electromagnetism, solar energy, force and motion, chemical properties, engineering and earthquakes, genetics. Mostly targeted at middle school levels.