Science Snacks
Check out these bite-size science exhibits and demonstrations that teachers can make using common, inexpensive, easily available materials. Covering a wide-variety of science topics, these exhibits were designed by the Exploratorium science museum in San Francisco with the help of classroom teachers.
Source: Exploratorium Intended Audience: Teachers Reading Level: N/A Teacher Section: Yes Searchable: No

Teacher's Domain
You'll find science and social studies lesson plans, video clips, images, animations, and other multimedia resources at this site from WGBH. Many of the resources at this site come from NOVA, American Experience, and other public television productions. You will find standards for each item selected as well as further information. In addition to content for the classroom, you will also find professional development opportunities. This is a free resource, but you will have to register.
Source: Teacher's Domain Intended Audience: Educators Reading Level: N/A Teacher Section: N/A Searchable: Yes

PathFinder Science
This virtual community of teachers, students, and schools participates in collaborative research projects. Project include water conservation, bird surveys, stream monitoring, and amphibian biomonitering. You must register your classroom to participate, registration is free.
Source: Pathfinder Science Intended Audience: Students/Teachers Reading Level: Varies Teacher Section: Yes Searchable: Yes

Science NetLinks
Looking for science resources? This site features reviewed Websites, lesson plans and other science resources for the K-12 classroom.
Source: Thinkfinity Intended Audience: Teachers Reading Level: High School Teacher Section: N/A Searchable: Yes

National Science Digital Library
This site features reviewed and cataloged science, math, and technology Websites, research articles, events, and news feeds for K-12 teachers, librarians, and university faculty.
Source: National Science Digital Library Intended Audience: Educators Reading Level: N/A Teacher Section: N/A Searchable: Yes

Computational Science Education Reference Desk
You'll find lesson plans, activities, tutorials, algorithms, interactive models, and more at this site that focuses on the use of computational science.
Source: National Science Digital Library Intended Audience: Students/Teachers Reading Level: High School Teacher Section: N/A Searchable: Yes

Middle School Portal
Find Web-based math, science, and technology resources specifically designed for use in the middle grades.
Source: National Science Digital Library Intended Audience: Students/Teachers Reading Level: High School Teacher Section: N/A Searchable: Yes

Audio Interviews
e. e. cummings on what makes an artist. Watson and Crick on the discovery of DNA. Any Warhol speaks on how he selected his portrait subjects. Artists, poets, writers, actors, politicians, scientists and other key figures of the 20th century are featured in audio interviews at this site from the BBC. In addition to the interviews, you will also find biographies.
Source: BBC Intended Audience: General Reading Level: High School Teacher Section: No Searchable: No

Science.gov
Searchable directory for science related information and resources from U.S. government agencies.
Source: Science.gov Alliance Intended Audience: General Reading Level: N/A Teacher Section: No Searchable: Yes

Science Friday
This companion site to the National Public Radio show hosted by Ira Flatow features live audio broadcasts as well as archived shows. You will also find a Kids' Connection section with lesson plans for each of the shows.
Source: NPR Intended Audience: General Reading Level: N/A Teacher Section: Yes Searchable: No

National Science Foundation
You'll find the latest science news and discoveries at this site. Be sure to check out the multimedia gallery for audio, video, and animations and the classroom resource section for links to Websites for the K-12 classroom.
Source: NSF Intended Audience: General Reading Level: N/A Teacher Section: Yes Searchable: Yes

Cornell University Math and Science Gateway
This site offers links to to resources in mathematics and science for educators and students in grades 9-12. You can access sites by topic area. Many of the sites referenced can also be used with younger students.
Source: Cornell University Intended Audience: Teachers/Students Reading Level: Middle Teacher Section: N/A Searchable: No