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I did study math and had a knack for it, but I am sooo out of that business now ...
Mathematics
Q&A for people studying math at any level and professionals in related fields
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Stack Overflow
Q&A for professional and enthusiast programmers
Travel
Q&A for road warriors and seasoned travelers
Information Security
Q&A for information security professionals
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Server Fault
Q&A for system and network administrators
Puzzling
Q&A for those who create, solve, and study puzzles
Super User
Q&A for computer enthusiasts and power users
Chess
Q&A for serious players and enthusiasts of chess
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Physics
Q&A for active researchers, academics and students of physics
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Politics
Q&A for people interested in governments, policies, and political processes
Blender
Q&A for people who use Blender to create 3D graphics, animations, or games
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
Graphic Design
Q&A for Graphic Design professionals, students, and enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Ask Ubuntu
Q&A for Ubuntu users and developers
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
English Language Learners
Q&A for speakers of other languages learning English
Law
Q&A for legal professionals, students, and others with experience or interest in law
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Personal Finance & Money
Q&A for people who want to be financially literate
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Joomla
Q&A for Joomla! administrators, users, developers and designers
Arqade
Q&A for passionate videogamers on all platforms
Chinese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Chinese language
Photography
Q&A for professional, enthusiast and amateur photographers
Astronomy
Q&A for astronomers and astrophysicists
Academia
Q&A for academics and those enrolled in higher education
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Engineering
Q&A for professionals and students of engineering
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Computer Science
Q&A for students, researchers and practitioners of computer science
User Experience
Q&A for user experience researchers and experts
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Area 51
Q&A for proposing new sites in the Stack Exchange network
Literature
Q&A for scholars and enthusiasts of literature
Code Review
Q&A for peer programmer code reviews
Motor Vehicle Maintenance & Repair
Q&A for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
Computational Science
Q&A for scientists using computers to solve scientific problems
The Workplace
Q&A for members of the workforce navigating the professional setting
Bicycles
Q&A for people who build and repair bicycles, people who train cycling, or commute on bicycles
Computer Science Educators
Q&A for those involved in the field of teaching Computer Science
The Great Outdoors
Q&A for people who love being outdoors enjoying nature and wilderness, and learning about the required skills and equipment
Retrocomputing
Q&A for vintage-computer hobbyists interested in restoring, preserving, and using the classic computer and gaming systems of yesteryear
Latin Language
Q&A for linguists, teachers, and students wanting to discuss the finer points of the Latin language
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Internet of Things
Q&A for builders and users of networked sensors and control devices in the contexts of smart homes, industry automation, or environmental sensors
Drones and Model Aircraft
Q&A for experienced flyers, pilots, and builders of drones and model aircraft
Software Quality Assurance & Testing
Q&A for software quality control experts, automation engineers, and software testers
Arts & Crafts
Q&A for artists and crafters
Russian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
Gardening & Landscaping
Q&A for gardeners and landscapers
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Italian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Italian language
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Sports
Q&A for participants in team and individual sport activities
Beer, Wine & Spirits
Q&A for alcoholic beverage aficionados and those interested in beer, wine, or spirits
Writing
Q&A for the craft of professional writing, including fiction, non-fiction, technical, scholarly, and commercial writing
Biology
Q&A for biology researchers, academics, and students
Seasoned Advice
Q&A for professional and amateur chefs
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
Salesforce
Q&A for Salesforce administrators, implementation experts, developers and anybody in-between
Home Improvement
Q&A for contractors and serious DIYers
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Ask Different
Q&A for power users of Apple hardware and software
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Aviation
Q&A for aircraft pilots, mechanics, and enthusiasts
Islam
Q&A for Muslims, experts in Islam, and those interested in learning more about Islam
Mathematica
Q&A for users of Wolfram Mathematica
Open Source
Q&A for people organizing, marketing or licensing open source development projects
Game Development
Q&A for professional and independent game developers
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Ask Patents
Q&A for people interested in improving the patent system
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills
Programming Language Design and Implementation
Q&A for designers and implementers of computer programming languages
Proof Assistants
Q&A for mathematicians and computer scientists who develop and use proof assistants
Community Building
Q&A for community managers, administrators, and moderators