I'm a German high-school student, interested in mathematics and computer science.
Reverse Engineering
Q&A for researchers and developers who explore the principles of a system through analysis of its structure, function, and operation
German Language & Usage
Q&A for speakers of German wanting to discuss the finer points of the language and translation
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Server Fault
Q&A for professional system and network administrators
Programming Puzzles & Code Golf
Q&A for programming puzzle enthusiasts and code golfers
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Role-playing Games
Q&A for gamemasters and players of tabletop, paper-and-pencil role-playing games
User Experience
Q&A for user experience researchers and experts
Stack Apps
Q&A for apps, scripts, and development with the Stack Exchange API
Game Development
Q&A for professional and independent game developers
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems.
Mathematics
Q&A for people studying math at any level and professionals in related fields
Programmers
Q&A for professional programmers interested in conceptual questions about software development
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Web Applications
Q&A for power users of web applications
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
English Language Learners
Q&A for speakers of other languages learning English
Board & Card Games
Q&A for people who like playing board games, designing board games or modifying the rules of existing board games
Computer Science
Q&A for students, researchers and practitioners of computer science
The Workplace
Q&A for members of the workforce navigating the professional setting
Academia
Q&A for academics and those enrolled in higher education
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Genealogy & Family History
Q&A for expert genealogists and people interested in genealogy or family history