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Animals
- Dinosaur Facts
- Endangered Species - U.S. Fish and Wildlife
- A to Z Index of Animals
Astronomy & Space
- Astronomy Picture for the Day
- Imagine the Universe
- NASA
- Planetary Sciences
- Space Calendar
- Stardate Online
- Sunrise and Sunset Calculator
Biosciences & Chemistry
- Chem4kids: basic chemistry help and information.
- Ptable: a dynamic periodic table of the elements.
- Periodic Table of Tech: how elements are used in everyday tech.
Computers & Technology
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Earth Sciences
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Environment & Ecology
- Ecology.com
- EPA Envirofacts Warehouse
- Reduce, Reuse, Recycle
- National Council for Science and the Environment
- PLANTS National Database - USDA
- Rain Forest Alliance
General Science
- Extreme Science
- Franklin Institute - Resources for Science Learning
- How Stuff Works
- National Geographic
- NatureServe
- PATENTS - U.S. Patent and Trademark Office
- Scientific American Homepage
Mathematics
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People in Science
- Biographies of Women Mathematicians
- Famous Scientists
- Inventors Hall of Fame
- NASA Astronaut Biographies
- Nobel Prize
- Strange Science Biographies
Physics
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