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TeX - LaTeX
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Geographic Information Systems
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Super User
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Academia
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Mathematica
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Code Golf
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Unix & Linux
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Robotics
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Meta Stack Exchange
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Computational Science
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Earth Science
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Signal Processing
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Data Science
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English Language & Usage
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Arduino
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Movies & TV
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Stack Overflow
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Biology
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Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
MathOverflow
Q&A for professional mathematicians