USGS Learning Web
Natural science site from the U.S. Geological Survey.
Grades: K-2, 3-5, 6-8, 9-12
The Learning Web is a showcase of selected USGS educational resources for K-12 teachers, students, and explorers of all ages.
Putting DNA to Work
Not an employment site, but one focused on applications of bio-science.
The Marian Koshland Science Museum of the National Academy of Science presents this site that details several current applications of DNA sequencing, from tracking the origin of SARS to criminal forensics.
Content-rich, straightforward site to supplement physics instruction.
Activity-Based Physics is a multi-university collaborative effort that uses current research and computer tools to promote activity-based models of physics instruction. Included are homework assignments, thinking problems, and estimation problems.
Calendars Through the Ages
Authoritative site on a variety of the world's calendars.
Grades: 3-5, 6-8
The Institute for Dynamic Educational Advancement (IDEA) provides information on how the Gregorian (Christian) calendar was developed as well as the calendars of other cultures.
Geologic Time: The Story of a Changing Earth
Elegant site presents our planet's eons, eras, periods, and epochs.
Grades: 6-8, 9-12
The Paleobiology Department at The Smithsonian National Museum of Natural History developed this site to provide an interactive timeline of geological history.
Exploring the Nano World
The world, that is, at the scale of atoms and molecules.
Grade Level: 6-8, 9-12
This site produced by the University of Wisconsin, Madison Materials Research Science and Engineering Center (MRSEC) Interdisciplinary Education Group (IEG), has as its goal, "to introduce you to the tools that let us "see" atoms, manipulate them, and create nano-architectural wonders." Included are teaching modules, videos, slide shows, and more.