MathOverflow

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Q&A for professional mathematicians

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Super User

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Q&A for computer enthusiasts and power users

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Computer Graphics Stack Exchange

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Q&A for computer graphics researchers and programmers

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Board & Card Games Stack Exchange

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Q&A for people who like playing board games, designing board games or modifying the rules of existing board games

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Windows Phone Stack Exchange

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Q&A for enthusiasts and power users of Windows Phone OS

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Parenting Stack Exchange

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Q&A for parents, grandparents, nannies and others with a parenting role

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Personal Productivity Stack Exchange

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Q&A for people wanting to improve their personal productivity

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Meta Stack Overflow

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Q&A about the site for professional and enthusiast programmers

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English Language Learners Stack Exchange

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Q&A for speakers of other languages learning English

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