Science
- Animal Diversity Web
- Animal Info - Information on Endangered Mammals
- Animal Words (Collective Nouns, Offspring, Gender Names)
- Electronic Zoo
- Endangered Species (U.S. Fish & Wildlife Service)
- Exploratorium: Sport Science
- Extreme Science (Largest, Longest, Fastest, etc.)
- Field Guides (eNature.com)
- Geological Time Machine (UCMP)
- Invent Now: National Inventor's Hall of Fame
- IUCN Red List of Threatened Species
- Khan Academy-free tutorials
- NASA
- The Nine 8 Planets
- Right to Know Hazardous Substance Fact Sheets
- Science and Engineering Statistics (National Science Foundation)
- Science and Technology (The Internet Public Library)
- Science Daily
- Science Fair Project Resource Guide
- Science in the Headlines
- Science.gov: FirstGov for Science
- Scientific American - Ask the Experts
- U. C. Berkeley Museum of Paleontology
- Units of Measurement
- U.S. Dept of Health & Human Services-K-12 Science and Health Education
- Volcano World
- Water Basics
- WebElements: the periodic table on the web
- WebExhibits
- The WhyFiles: Science Behind the News
- World Wide Web Virtual Library: Science Fairs
