![](https://cdn.statically.io/img/i.sstatic.net/PGM80.png?s=128&g=1)
Homo Mathematicus
— Run and look ! —
— Unsolved questions... —
— More unsolved questions : (3), (4) —
Mathematics
Q&A for people studying math at any level and professionals in related fields
MathOverflow
Q&A for professional mathematicians
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
History of Science and Mathematics
Q&A for people interested in the history and origins of science and mathematics
Music: Practice & Theory
Q&A for musicians, students, and enthusiasts
Earth Science
Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences
French Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the French language
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Music Fans
Q&A for music historians, critics, and fans
Biology
Q&A for biology researchers, academics, and students
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
Mathematics Educators
Q&A for those involved in the field of teaching mathematics
Physics
Q&A for active researchers, academics and students of physics
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Astronomy
Q&A for astronomers and astrophysicists
Information Security
Q&A for information security professionals
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Lifehacks
Q&A for people looking to bypass life's everyday problems with simple tricks
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Amateur Radio
Q&A for amateur radio enthusiasts
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Linguistics
Q&A for professional linguists and others with an interest in linguistic research and theory
Video Production
Q&A for engineers, producers, editors and enthusiasts spanning the fields of video and media creation
Skeptics
Q&A for scientific skepticism
Stack Overflow
Q&A for professional and enthusiast programmers
The Workplace
Q&A for members of the workforce navigating the professional setting
Language Learning
Q&A for students, teachers, polyglots, and anyone interested in the techniques of second-language acquisition
Sustainable Living
Q&A for folks dedicated to a lifestyle that can be maintained indefinitely without depleting available resources
Physical Fitness
Q&A for physical fitness professionals, athletes, trainers, and those providing health-related needs
Movies & TV
Q&A for movie and TV enthusiasts
Computer Science
Q&A for students, researchers and practitioners of computer science
Philosophy
Q&A for those interested in the study of the fundamental nature of knowledge, reality, and existence
Chemistry
Q&A for scientists, academics, teachers, and students in the field of chemistry
Puzzling
Q&A for those who create, solve, and study puzzles
Academia
Q&A for academics and those enrolled in higher education
History
Q&A for historians and history buffs
Photography
Q&A for professional, enthusiast and amateur photographers
Politics
Q&A for people interested in governments, policies, and political processes
Portuguese Language
Q&A for linguists, teachers and learners wanting to discuss the finer points of the Portuguese language
Russian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Russian language
Spanish Language
Q&A for linguists, teachers, students and Spanish language enthusiasts in general wanting to discuss the finer points of the language
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Sports
Q&A for participants in team and individual sport activities
Psychology & Neuroscience
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Italian Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Italian language
Japanese Language
Q&A for students, teachers, and linguists wanting to discuss the finer points of the Japanese language
Korean Language
Q&A for linguists, teachers and students of the Korean language
German Language
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Engineering
Q&A for professionals and students of engineering
Computational Science
Q&A for scientists using computers to solve scientific problems
Ask Different
Q&A for power users of Apple hardware and software
Mathematica
Q&A for users of Wolfram Mathematica
Parenting
Q&A for parents, grandparents, nannies and others with a parenting role
Worldbuilding
Q&A for writers/artists using science, geography and culture to construct imaginary worlds and settings
Veganism & Vegetarianism
Q&A for those committed to a vegan or vegetarian lifestyle and anyone interested in learning more
Constructed Languages
Q&A for designers and users of artificial or invented languages, consciously developed instead of having developed naturally
Interpersonal Skills
Q&A for people looking to improve their interpersonal communication skills