- 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.
- KnowWhat.com
- Questions and answers provide examples of scientific principles at work in everyday life, and explain why things are the way they are.
- Last Word
- Why is the sky blue? Why does hair turn grey? Answers to readers' questions from the column in New Scientist magazine.
- 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.
- Science Whatzit!
- The Oregon Museum of Science and Industry will try to answer your science questions and stumpers that you just can't find the answers to.
- 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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