| Experts Exchange - Free online "ask an expert" site for computer questions.
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| Ask A Scientist - You can ask a scientist a question on the WWW MadSciNet: The 24-hour exploding laboratory.
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| Ask a Marine Science Expert - Email your question after checking the archive of previous questions and answers.
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| Ask A Scientist About Liquid Crystals - A starting point for students and teachers interested in liquid crystals and the science and mathematics from which they arise: physics, chemistry, mathematics, computer science, polymer science, display engineering and information management.
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| Ask a Volcanologist - All things volcano related, plus archives of previous questions.
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| Ask An Earth Scientist - Experts at the University of Hawaii answer questions related to earth science.
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| Ask The Space Scientist - Ask a question and check out the extensive archives for the many questions asked at this site.
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| Ask Dr. Universe - Courtesy of Washington State University, Dr. Universe has a whole university full of experts ready to tackle your question on any subject. Explore the question of the day, longer featured answers, links, and wallpapers.
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| Ask Bob Treat - Answers to questions in the natural, social and computer sciences from Bob Treat. Post your question and you'll usually get a response within 24 hours.
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| ScienceNet - A free science information service, staffed by scientists who are expert in explaining complex topics in everyday language. Search the online database of previously answered questions, otherwise submit a question via e-mail.
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| Ask Mr. Water Wizard - Do you have questions about water? Questions about water quality in some nearby stream or lake? About drinking water? About water quality testing? About aquatic life such as fish, turtles, snakes, and insects, in your local waterways? Mr. Water Wizard can help.
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| Physlink - Ask Experts Physics and Astronomy Questions - Ask questions and check out the archives, organized by topic.
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| Curious about Astronomy? Ask an Astronomer! - Browse archives of previous questions and answers, or submit a question to be answered by astronomers at Cornell University.
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| Science Questions & Answers - Expert responses to questions on biology, chemistry, geology, and other branches of science.
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| NEWTON Bulletin Board System - Ask-a-scientist service designed for K-12 teachers and their students - operated by the Argonne Nat'l. Laboratory, Div. of Educational Programs.
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| Ask Dr. Global Change - He stands ready to answer your most difficult questions about global change on planet Earth. Archives are available.
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| Ask a Rocket Scientist - Explains design, technology, aerodynamics, history, space travel, and other topics related to aerospace engineering.
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| Ask An Aviculture Expert - Birds and bird care questions. Not a substitute for a trip to the vet.
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| How Things Work - Ask about almost anything related to the physical world, and check the well-organized archives for answers to previous interesting questions.
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| Ask Shamu - Ask and read archives of questions and answers. Mainly about marine biology and the environment.
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| Ask A Geologist - Do you have a question about volcanoes, earthquakes, mountains, rocks, maps, ground water, lakes, or rivers? A service of the earth scientists at USGS.
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