I have discovered a truly marvelous demonstration of myself that this margin is too narrow to contain.

Cognitive Sciences
Q&A for practitioners, researchers, and students in cognitive science, psychology, neuroscience, and psychiatry
Area 51
Stack Exchange Network staging zone, where users come together to build new Q&A sites
Physics
Q&A for active researchers, academics and students of physics
Personal Productivity
Q&A for people wanting to improve their personal productivity
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Game Development
Q&A for professional and independent game developers
Meta Stack Overflow
Q&A for meta-discussion of the Stack Exchange family of Q&A websites
Science Fiction & Fantasy
Q&A for science fiction and fantasy enthusiasts
Cross Validated
Q&A for statisticians, data analysts, data miners and data visualization experts
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Programmers
Q&A for professional programmers interested in conceptual questions about software development
Theoretical Computer Science
Q&A for theoretical computer scientists and researchers in related fields
Biology
Q&A for biology researchers, academics, and students
LEGO® Answers
Q&A for LEGO® and building block enthusiasts
Academia
Q&A for academics and those enrolled in higher education
The Workplace
Q&A for members of the workforce navigating the professional setting