Each post belongs to exactly one category. There are the following categories (in alphabetical order):

Big data & data science  - Big data, data science, data bases 8
Economics  - Economics from a computer science perspective 16
Games  - Computer games 8
GPU Computing  - Using GPUs for non-graphical computing 22
Science  - All sorts of sciences 9
Software Development  - Software Development 71
Work related  - Project management, good presentations, social skills, etc. 10