Physics
Q&A for active researchers, academics and students of physics
Mathematics
Q&A for people studying math at any level and professionals in related fields
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Astronomy
Q&A for astronomers and astrophysicists
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Economics
Q&A for those who study, teach, research and apply economics and econometrics
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Mathematica
Q&A for users of Wolfram Mathematica
Artificial Intelligence
Q&A for people interested in conceptual questions about life and challenges in a world where "cognitive" functions can be mimicked in purely digital environment
MathOverflow
Q&A for professional mathematicians
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
English Language Learners
Q&A for speakers of other languages learning English
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
Bitcoin
Q&A for Bitcoin users, developers, and enthusiasts
Personal Finance & Money
Q&A for people who want to be financially literate
Chess
Q&A for serious players and enthusiasts of chess
The Workplace
Q&A for members of the workforce navigating the professional setting
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Travel
Q&A for road warriors and seasoned travelers
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Stack Overflow
Q&A for professional and enthusiast programmers
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Quantum Computing
Q&A for engineers, scientists, programmers, and computing professionals interested in quantum computing
Politics
Q&A for people interested in governments, policies, and political processes
Literature
Q&A for scholars and enthusiasts of literature
Biology
Q&A for biology researchers, academics, and students
Computer Science
Q&A for students, researchers and practitioners of computer science
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Academia
Q&A for academics and those enrolled in higher education
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Law
Q&A for legal professionals, students, and others with experience or interest in law
Server Fault
Q&A for system and network administrators
History
Q&A for historians and history buffs
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
Medical Sciences
Q&A for professionals in medical and allied health fields, students of those professions, related academics, and others with a sound understanding of medicine and healthcare-related sciences