Mathematics
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Programmers
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Science Fiction & Fantasy
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Physics
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Stack Overflow
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English Language & Usage
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Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Graphic Design
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Computer Science
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Board & Card Games
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Chemistry
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Writers
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Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Windows Phone
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Martial Arts
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Theoretical Computer Science
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Server Fault
Q&A for professional system and network administrators
WordPress Answers
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Mi Yodeya
Q&A for those who base their lives on Jewish law and tradition and anyone interested in learning more
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Electrical Engineering
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Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Ask Different
Q&A for power users of Apple hardware and software
Photography
Q&A for professional, enthusiast and amateur photographers
User Experience
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Computational Science
Q&A for scientists using computers to solve scientific problems
Sports
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Academia
Q&A for academics and those enrolled in higher education
The Workplace
Q&A for members of the workforce navigating the professional setting
English Language Learners
Q&A for speakers of other languages learning English
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Ask Patents
Q&A for people interested in improving and participating in the patent system
Robotics
Q&A for professional robotic engineers, hobbyists, researchers and students
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Answers OnStartups
Q&A for entrepreneurs looking to start or run a new business
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Personal Finance & Money
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Quantitative Finance
Q&A for finance professionals and academics
Personal Productivity
Q&A for people wanting to improve their personal productivity
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Christianity
Q&A for committed Christians, experts in Christianity and those interested in learning more
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Japanese Language & Usage
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Musical Practice & Performance
Q&A for musicians, students, and enthusiasts