1. Social science
   1. Anthropology
   2. Economics
   3. Education
   4. Human geography
   5. History
   6. Family and consumer science
      1. Interior design
      2. Foodservice
      3. Housing
      4. Space science
   7. Law
   8. Linguistics
   9. Political science
   10. Psychology
   11. Sociology
   12. Criminology
   13. Archaeology
   14. Sexology
   15. Healthcare science
   16. Nutrition
2. Humanities
   1. Cooking
      1. Ingredients
         1. Carbohydrates
         2. Fats
         3. Proteins
         4. Vitamins
         5. Water
         6. Minerals
   2. Language
   3. Literature
   4. Cultural movement
      1. Greco-Roman world
      2. Romanesque art
      3. Gothic art
      4. Nominalism
      5. Renaissance humanism
      6. Renaissance
      7. Mannerism
      8. Baroque
      9. Rococo
      10. Neoclassicism
      11. Age of Enlightenment
      12. Romanticism
      13. Realism
      14. Art Nouveau
      15. Modernism
      16. Postmodernism
      17. Post-postmodernism
   5. Art
      1. Performing arts
      2. Visual arts
         1. Animation
         2. Comics
   6. Entertainment
      1. Comedy
      2. Dance
      3. music
      4. Concert
      5. Lecture
      6. Games
         1. Board games
         2. Card game
         3. Video game
         4. Role-playing game
      7. Humour
      8. Magic
      9. Mass media
      10. Radio
      11. Sports
      12. Storytelling
      13. Cinema
      14. Festival
   7. Sport
      1. Association football
      2. American football
      3. American football
      4. Baseball
      5. Cue sports
      6. Golf
      7. Swimming (sport)
   8. Mass media
      1. Internet
      2. Newspaper
      3. Publication
      4. Radio
      5. Television
   9. Health and fitness
      1. Self-care
      2. Nutrition
      3. Physical exercise
         1. Exercise physiology
         2. Exercise equipment
         3. Aerobic exercise
         4. Anaerobic exercise
         5. Weight training
         6. Stretching
         7. Walking
         8. Jogging
         9. Yoga
         10. Swimming
         11. Resistance training
         12. Strength training
      4. Hygiene
      5. Medicine
      6. Illness
         1. Ageing
         2. Nutrition disorder
         3. Major depressive disorder
         4. Disease
         5. Disorder
            1. Eating disorder
         6. Substance abuse
         7. Foodborne illness
         8. Malnutrition
         9. Obesity
   10. People and self
       1. Person
       2. Self
       3. People
       4. Personal life
          1. Career
       5. Thought
          1. Decision making
          2. Creativity
          3. Emotional intelligence
          4. Learning
          5. Memory
          6. Problem solving
          7. Reason
          8. Cognitive bias
          9. gnitive distortion
   11. History and events
3. Nature
   1. Organism
      1. Animal
      2. Plant
   2. Geography
      1. City
      2. Climate
      3. Landform
      4. Body of water
      5. Manmade geographical features
4. Natural science
   1. Earth science
      1. Geology
      2. Glaciology
      3. Oceanography
      4. Soil science
   2. Mathematics
      1. Algebra
      2. Arithmetic
      3. Calculus
      4. Geometry
      5. Mathematical logic
      6. Probability theory
      7. Number theory
      8. Combinatorics
      9. Graph theory
      10. Set theory
      11. Topology
      12. Mathematical analysis
      13. Mathematical proof
      14. Trigonometry
   3. Biology
      1. Histology
      2. Neuroscience
      3. Abiogenesis
      4. Paleontology
      5. Parasitology
      6. Pathology
      7. Physiology
         1. Human physiology
            1. Nervous system
            2. Human musculoskeletal system
            3. Circulatory system
            4. Respiratory system
            5. Human gastrointestinal tract
            6. Integumentary system
            7. Urinary system
            8. Reproductive system
            9. Immune system
            10. Endocrine system
            11. Alpha taxonomy
            12. Ethology
      8. Anthropology
   4. Chemistry
   5. Heuristic
   6. Information science
   7. Physics
   8. Systems theory
5. Formal sciences
   1. Information theory
   2. Logic
   3. Statistics
   4. Theoretical computer science
      1. Theory of computation
      2. Information theory
      3. Coding theory
      4. Algorithms and data structures
      5. Programming language theory
      6. Formal methods
      7. Concurrency (computer science)
      8. Distributed computing
      9. Databases
      10. Database management systems
6. Engineering & Applied science
   1. Computer science
      1. Artificial intelligence
      2. Computer architecture
      3. Computer engineering
         1. Operating system
            1. Process management
            2. Interrupt
            3. Memory management
            4. File system
            5. Device driver
            6. Computer network
            7. Input/output
      4. Computer graphics
      5. Computer security
      6. Cryptography
      7. Computational science
      8. Information science
      9. Software engineering
   2. Architecture
   3. Sports science
   4. Military science
   5. Metrology
   6. Ergonomics
   7. Electrical engineering
   8. Biological engineering
   9. Mechanical engineering