Stack Overflow
Q&A for professional and enthusiast programmers
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Physics
Q&A for active researchers, academics and students of physics
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Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
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Computational Science
Q&A for scientists using computers to solve scientific problems
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TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
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Mathematics
Q&A for people studying math at any level and professionals in related fields
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Ask Ubuntu
Q&A for Ubuntu users and developers
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Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
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Server Fault
Q&A for system and network administrators
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