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It allows users to ask, answer and comment on graduate-level physics questions, post and review manuscripts from ArXiv (which lists PhysicsOverflow discussion pages among its trackbacks [3]) and other sources, and vote on both forms of content.
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Yahoo! Answers: 2005: 2021: All topics: 13 languages: Contributions owned by the author. Yahoo retains rights to the use, distribution or modification. [12] No Zhihu: 2011 — Many topics: Chinese and a few others: Owned and operated by the original authors. Yes, except to view answers of questions when directed from search engine
In 2016, Stack Exchange added a variety of new sites which pushed the boundaries of the typical question-and-answer site. [26] For example, Puzzling offers a platform for users who already know the answer to questions to challenge their peers to solve the problems unlike traditional Q–A sites where the poster does not know the answer. [26]
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A question and answer system (or Q&A system) is an online software system that attempts to answer questions asked by users.Q&A software is frequently integrated by large and specialist corporations and tends to be implemented as a community that allows users in similar fields to discuss questions and provide answers to common and specialist questions.
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A 2013 study has found that 75% of users only ask one question, 65% only answer one question, and only 8% of users answer more than 5 questions. [34] To empower a wider group of users to ask questions and then answer, Stack Overflow created a mentorship program resulting in users having a 50% increase in score on average. [35]