Stack Overflow
Q&A for professional and enthusiast programmers
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Q&A for power users of Apple hardware and software
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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Astronomy
Q&A for astronomers and astrophysicists
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Physics
Q&A for active researchers, academics and students of physics
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Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
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