Hosted by the University of Amherst, this site allows users to ask philosophical questions and receive responses from philosophers. The website warns submissions won't be posted if they're unintelligible, vague, clearly scientific, concern a personal problem, or have other issues.
You can search to see if your question has already been answered.
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Email questions about earth sciences to this site, and United States Geological Survey scientists will respond if your homework question is among the 88 percent answered. USGS scientists have responded since 1994 but won't answer test questions, write reports, answer questions with direct financial impacts, recommend products or companies, or identify rocks from photos.
Questions to the site, hosted by Columbia University’s health department, are answered by health care professionals, information and research specialists, and writers.
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Online classes are convenient, but they usually don’t offer the support of a traditional university.
The site asks users to avoid sending homework questions, though it can be used for research issues. This site, launched in 2002, typically sees more than a million visitors a month during the school year.
Answers are typically sent within five business days. Everything on the site is free, supported by advertising, though some links take you to fee-based sites.