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Experts Exchange Ask questions about all things related to computers. You must register/login before you can participate at this site.
Ask a Marine Science Expert Email your question after checking the archive of previous questions and answers.
Ask a Volcanologist All things volcano related, plus archives of previous questions.
Ask The Space Scientist Ask a question and check out the extensive archives for the many questions asked at this site.
Ask Dr. Universe Dr. Universe has a whole university full of experts ready to tackle your question on any subject. Explore the question of the day, and longer featured answers.
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.
Physlink - Ask Experts Physics and Astronomy Questions Ask questions and check out the archives, organized by topic.
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.
Science Questions & Answers Expert responses to questions on biology, chemistry, geology, and other branches of science.
Ask Dr. Global Change He stands ready to answer your most difficult questions about global change on planet Earth. Archives are available.
Ask a Rocket Scientist Explains design, technology, aerodynamics, history, space travel, and other topics related to aerospace engineering.
Ask An Aviculture Expert Birds and bird care questions. Not a substitute for a trip to the vet.
How Things Work Ask about almost anything related to the physical world, and check the well-organized archives for answers to previous interesting questions.
Ask Shamu Ask and read archives of questions and answers. Mainly about marine biology and the environment.
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.
Computer Help Center Helpful Answers to your Computer and Internet-related Questions.
Ask A Scientist You can ask a scientist a question on the WWW MadSciNet: The 24-hour exploding laboratory.
What is? What! Aims to give you easy answers to everyday questions. We define words, acronyms, and ideas. We have a computer-related and open-source slant.