List of skills that fall under the [Knowledge] tree. List is subject to change. Indents denote prerequisites. This is a game system, and not reflective of my opinion on the difficulty of any individual field of study.
[Basic: Math]
[Math: Chemistry]
[Math: Physics]
[Math: Advanced Math]
[Advanced Math: Engineering]
[Engineering: Electrical Engineering]
[Engineering: Mechanical Engineering]
[Engineering + Chemistry: Chemical Engineering]
[Advanced Math + Physics: Advanced Physics]
[Basic: Biology]
[Biology + Chemistry: Biochemistry]
[Biology: Human Anatomy]
[Human Anatomy: Nursing]
[Human Anatomy + Chemistry: Pharmaceuticals]
[Biology: Microbiology]
[Biology: Mycology]
[Basic: Programming]
[Programming + Math: Computer Science]
[Computer Science: Software Engineering]
[Software Engineering + Electrical Engineering: Robotics]
[Computer Science + Advanced Math: Data Science]
[Basic: Logic]
[Logic: Law]
[Law: Criminal]
[Law: Residential]
[Law: Workplace]
[Basic: Geography]
[Geography: Cartography]