- Ask Dr. Fred
- Scientist, researcher, and teacher Dr. Fred Bortz will answer questions about any scientific topic that interests you. - Ask Dr. Universe
 - You can ask Dr. Universe almost anything. She'll go to Washington State University's team of researchers to find the answers. - Did You Ever Wonder?
 - Answers 12 science-based questions a month by way of columnists in various fields of expertise. - Mad Scientist Network
- Provides answers to science questions, edible and inedible experiments, a tour of the Visible Human Project, and an index of resources and web links. - NEWTON BBS
- A place for K-12 science, math, and computer teachers and their students to communicate. Includes the Ask A Scientist programme that has fielded over 10,000 questions. - Science Matters
- A question and answer forum. - ScienceNet
- Archive of science questions. Covers topics such as palaeontology, biology, chemistry, mathematics, environmental studies, physics, and variety applied sciences. - Scientific American: Ask the Experts
 - Current and archived questions and answers in the fields of astronomy, biology, chemistry, geology, mathematics, physics, computers, environment, and medicine.
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