I am a physics PhD student at the University of Southampton working in the field of Quantum Optomechanics.
Stack Overflow
Q&A for professional and enthusiast programmers
Signal Processing
Q&A for practitioners of the art and science of signal, image and video processing
Mathematics
Q&A for people studying math at any level and professionals in related fields
Cross Validated
Q&A for people interested in statistics, machine learning, data analysis, data mining, and data visualization
Physics
Q&A for active researchers, academics and students of physics
Emacs
Q&A for those using, extending or developing Emacs
Server Fault
Q&A for system and network administrators
Electrical Engineering
Q&A for electronics and electrical engineering professionals, students, and enthusiasts
Super User
Q&A for computer enthusiasts and power users
Data Science
Q&A for Data science professionals, Machine Learning specialists, and those interested in learning more about the field
Pets
Q&A for pet owners, caretakers, breeders, veterinarians, and trainers
Geographic Information Systems
Q&A for cartographers, geographers and GIS professionals
Information Security
Q&A for information security professionals
Quantum Computing
Q&A for engineers, scientists, programmers, and computing professionals interested in quantum computing
Arqade
Q&A for passionate videogamers on all platforms
Academia
Q&A for academics and those enrolled in higher education
Ask Different
Q&A for power users of Apple hardware and software
TeX - LaTeX
Q&A for users of TeX, LaTeX, ConTeXt, and related typesetting systems
Software Engineering
Q&A for professionals, academics, and students working within the systems development life cycle
The Workplace
Q&A for members of the workforce navigating the professional setting
Unix & Linux
Q&A for users of Linux, FreeBSD and other Un*x-like operating systems
English Language & Usage
Q&A for linguists, etymologists, and serious English language enthusiasts
Meta Stack Exchange
Q&A for meta-discussion of the Stack Exchange family of Q&A websites