Do you have a question about volcanoes, earthquakes, mountains, rocks, maps, ground water, lakes, or rivers? A service of the earth scientists at USGS.

Email your question after checking the archive of previous questions and answers.

Explains design, technology, aerodynamics, history, space travel, and other topics related to aerospace engineering.

You can ask a scientist a question on the WWW MadSciNet: The 24-hour exploding laboratory.

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.

All things volcano related, plus archives of previous questions.

Birds and bird care questions. Not a substitute for a trip to the vet.

Experts at the U of Hawaii answer questions about volcanoes and igneous rocks, earthquakes and seismology, natural disasters, geochemistry, the environment, pollution, hydrology and water quality, minerals, gems and crystals, geophysics, sediments and sedimentary rocks, and just plain ol' geology.

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.

He stands ready to answer your most difficult questions about global change on planet Earth. Archives are available.

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.

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.

Ask and read archives of questions and answers. Mainly about marine biology and the environment.

Ask a question and check out the extensive archives for the many questions asked at this site.

Helpful Answers to your Computer and Internet-related Questions.

Browse archives of previous questions and answers, or submit a question to be answered by astronomers at Cornell University.

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Ask about almost anything related to the physical world, and check the well-organized archives for answers to previous interesting questions.

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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Expert responses to questions on biology, chemistry, geology, and other branches of science.

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. If you can't find an answer then send your question via e-mail.