Mayo Clinic specialists answer select medical questions.
http://image.gsfc.nasa.gov/poetry/ask/askmag.html
Ask a question and check out the archives for the many questions asked at this site.
http://www.goaskalice.columbia.edu/ask.html
Anonymous health questions and answer service.
http://curious.astro.cornell.edu/
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.
http://www.howeverythingworks.org/
Ask about almost anything related to the physical world, and check the well-organized archives for answers to previous interesting questions.
Get answers and share expertise with the others in the community.
http://www.newton.dep.anl.gov/
Ask-a-scientist service designed for K-12 teachers and their studentsoperated by the Argonne Natl. Laboratory, Div. of Educational Programs.
http://www.peoplesnetwork.gov.uk/
Peoples NetworkElectronic reference library combining resources of the UKs public libraries. Ask questions and check the archives for previous answers. Find readers groups and reading links.
http://mathforum.org/dr.math/
Ask Dr. Math a question or browse the archive of previous questions and answers.
http://walrus.wr.usgs.gov/ask-a-geologist/
Ask earth scientists at USGS questions about volcanoes, earthquakes, mountains, rocks, maps, ground water, lakes, or rivers through email.