Coding keeps me healthy. My main StackExchange haunt is Stack Overflow. My pet project currently is the Little Go iOS app. My level of activity on SO varies, but the importance of #SOreadytohelp remains constant.
I avidly read Science Fiction, mostly older stuff, which is probably why I don't like scifi.stackexchange.com very much.
I get very excited by Space Exploration. Nobody around me shares my feelings, so I regularly make a fool of myself. It may also have been a mistake to tell people how much time I spend exploring the semi-fictitious galaxy of Elite: Dangerous.
Stack Overflow
Q&A for professional and enthusiast programmers
Ask Different
Q&A for power users of Apple hardware and software
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Space Exploration
Q&A for spacecraft operators, scientists, engineers, and enthusiasts
Drupal Answers
Q&A for Drupal developers and administrators
Super User
Q&A for computer enthusiasts and power users
Arqade
Q&A for passionate videogamers on all platforms
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Server Fault
Q&A for system and network administrators
Mathematics
Q&A for people studying math at any level and professionals in related fields
English Language Learners
Q&A for speakers of other languages learning English
Software Recommendations
Q&A for people seeking specific software recommendations
Raspberry Pi
Q&A for users and developers of hardware and software for Raspberry Pi
Web Applications
Q&A for power users of web applications
Information Security
Q&A for information security professionals
Photography
Q&A for professional, enthusiast and amateur photographers
Cryptography
Q&A for software developers, mathematicians and others interested in cryptography
Game Development
Q&A for professional and independent game developers
Database Administrators
Q&A for database professionals who wish to improve their database skills and learn from others in the community
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
Area 51
Q&A for proposing new sites in the Stack Exchange network