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This article is about the current version of DF.

A diagram of all knowledge topics.

Topics (also Tech or Innovations) are part of knowledge.

There are around 300 innovations that can be discovered. Many of them have requirements, and many do not, so it's kind of a tech forest/grassland rather than a tree. Notably missing are innovations related to practical labors in the game (which will be added later in development). Only the discovery of certain "form" type topics has any effect on gameplay, as it allows scholars to write new types of books; star charts, atlases, dictionaries and various historical forms.

Several innovations require innovations from other branches, and since all knowledge is individually tracked, that implies some investigators will need to be at least well-read if not skilled in various topics (there aren't currently joint research projects). There are some old and new mechanisms in place to ensure this happens.

There are 9 "branches" of the knowledge system. Each branch is further divided into categories of topics, such as methodologies, theories, etc.


Topic Description Wikipedia link Subdivision
Empirical observation Methods of empirical observation in astronomy Empirical evidence Method
Path models Orbit modeling Method
Astrography The creation of star charts Star chart n/a
Dates of lunar and solar eclipses Saros (astronomy) n/a
Daylight variation with solar year The variation of daylight with the season Daytime § Daytime variations with latitude and seasons n/a
Geocentrism The theory that the sun moves around the world Geocentric model n/a
Height of tides vs moon and sun The height of the tides, the moon and the sun Pytheas § Pytheas on the tides and Tide n/a
Heliocentrism The theory that the world moves around the sun Heliocentric model n/a
Path of the moon The path of the moon Orbit of the Moon n/a
Phases of the moon The phases of the moon Lunar phase n/a
Precession of equinoxes Axial precession n/a
Relationship between lunar/solar year The relationship between the lunar and solar year Lunisolar calendar n/a
Shape of the world Spherical Earth n/a
Star catalogues 100 Star catalogue n/a
Star catalogues 1000 Star catalogue n/a
Star magnitude classification Magnitude (astronomy) n/a
Stellar Spectroscopy The classification of stars based on the light they emit Astronomical spectroscopy n/a
Summer/winter moon The rise of the moon according to the season Lunar calendar n/a
Summer/winter sun The rise of the sun according to the season Solar calendar n/a
Tides and the moon The relationship between the moon and the tides Seleucus of Seleucia § Tides and Tide n/a


Topic Description Wikipedia link Subdivision
Adhesives The preparation and use of adhesive materials Adhesive Chemicals
Aqua regia The preparation of aqua regia Aqua regia Chemicals
Oil of vitriol The preparation of oil of vitriol Sulfuric acid Chemicals
Spirit of niter The preparation of spirit of niter Nitric acid Chemicals
Alkali and acids The classification of alkali and acids pH Classification
Combustibles The classification of combustible materials Combustibility Classification
Elemental theory The classification of materials based on which elemental materials might form them Classical element or Atomic theory Classification
Ores The classification of ores Ore Classification
Scratch test Scratch hardness Classification
Alembic The construction and use of the alembic Alembic Laboratory
Blast furnace The construction and use of the blast furnace Blast furnace Laboratory
Crucible The construction and use of the crucible Crucible Laboratory
Lab ovens The construction and use of laboratory ovens Laboratory oven Laboratory
Systematic experiments Methods for performing experiments systematically in the laboratory Scientific method Laboratory
Theory of distillation The theory and methods involved in distillation Distillation Laboratory
Theory of evaporation The theory and methods involved in evaporation Evaporation Laboratory
Theory of liquid-liquid extraction The theory and methods involved in the extraction of a constituent liquid from one solution to another Liquid–liquid extraction Laboratory
Ampoule The construction and use of the ampoule Ampoule Laboratory (glass)
Beaker The construction and use of the beaker Beaker Laboratory (glass)
Flask The construction and use of the flask Flask Laboratory (glass)
Funnel The construction and use of the funnel Funnel Laboratory (glass)
Retort The construction and use of the retort Retort Laboratory (glass)
Vial The construction and use of the vial Vial Laboratory (glass)
Alloys The mixing of metals to produce alloys Alloy Metallurgy


Topic Description Wikipedia link Subdivision
Armillary sphere The construction and use of armillary spheres Armillary sphere Astronomy
Astrolabe The construction and use of the astrolabe Astrolabe Astronomy
Dioptra The construction and use of the dioptra Dioptra Astronomy
Mural instrument The construction and use of a mural instrument or mural quadrant Mural instrument Astronomy
Orrery Orrery Astronomy
Spherical astrolabe Astrolabe Astronomy
Wood lamination The use of lamination Lamination Construction
Models and templates The use of models and templates in engineering Prototype and Stencil Design
Archimedes principle The law of fluid displacement Archimedes' principle Fluid
Force pump Piston pump § Force pump Fluid
Theory of siphon The action of the siphon Siphon Fluid
Valves The construction and use of valves Valve Fluid
Astrarium Astrarium Horology
Conical water clock Water clock Horology
Hourglass Hourglass Horology
Mechanical clock Clock § Early mechanical clocks Horology
Shadow clock The use of shadows to tell direction and time Sundial Horology
Water clock The use of water-based devices to tell time Water clock Horology
Water clock reservoir The use of reservoirs in water-based clocks to improve their accuracy Zhang Heng § Extra tank for inflow clepsydra Horology
Balance wheel Balance wheel Machine
Bellows The construction and use of the bellows Bellows Machine
Camshaft Camshaft Machine
Chain drive The construction and use of chain drives Chain drive Machine
Chariot odometer Odometer Machine
Combination lock Combination lock Machine
Crank Crank (mechanism) Machine
Crankshaft Crankshaft Machine
Differential gear Differential (mechanical device) Machine
Double acting piston bellows Bellows Machine
Lever The construction and use of the lever Lever Machine
Mechanical compass Compass Machine
Padlock The construction and use of the padlock Padlock Machine
Piston Piston pump § Force pump Machine
Pulley The construction and use of the pulley Pulley Machine
Screw The construction and use of the screw Screw Machine
Straight beam balance The construction and use of the straight-beam balance Weighing scale § Mechanical balances Machine
Theory of gears The reasons why gears are effective Gear Machine
Theory of lever The reasons why the lever is effective Lever Machine
Theory of pulley The reasons why pulleys are effective Pulley Machine
Theory of screw The reasons why screws are effective Screw Machine
Theory of wedge The reasons why the wedge is effective Wedge Machine
Theory of wheel and axle The reasons why the wheel-and-axle construction is effective Wheel and axle Machine
Trip hammer Trip hammer Machine
Tumbler lock The construction and use of the tumbler lock Pin tumbler lock Machine
Verge escapement The construction and use of the verge escapement Verge escapement Machine
Warded lock The construction and use of the warded lock Warded lock Machine
Water-powered piston bellows Du Shi § The Water-Powered Blast Furnace Machine
Water-powered sawmill Watermill Machine
Water-powered trip hammer Trip hammer and Water wheel Machine
Water wheel Water wheel Machine
Windlass The construction and use of the windlass Windlass Machine
Atmospheric refraction Atmospheric refraction Optics
Camera obscura The construction and use of the camera obscura Camera obscura Optics
Cause of twilight Atmospheric optics Optics
Crystal lens The construction and use of the crystal lens Lens (optics) and Crystal Optics
Glass lens The construction and use of the glass lens Lens (optics) and Glass Optics
Height of atmosphere Atmosphere of Earth Optics
Law of refraction Snell's law Optics
Parabolic mirror Parabolic reflector Optics
Theory of color Color theory Optics
Theory of rainbows Rainbows Optics
Water-filled spheres The construction and use of water-filled spheres as lenses Lens (optics) and History of optics § Early history of optics Optics


Topic Description Wikipedia link Subdivision
Accurate maps Map Cartography
Cartography The process involved in creating maps Cartography Cartography
Distance scale Scale (map) Cartography
Economic The placement of economic information on maps Economic geography Cartography
Geological The placement of geological information on maps Geologic map Cartography
Grid system Grid reference Cartography
Height measurements Topographic map and Levelling Cartography
Map projections Map projection Cartography
Atlases The collection of maps and other information together into a single text Atlas Form
Econometrics The process of economic data collection Econometrics Method
Cartographical surveying Cartography and Surveying Surveying
Engineering surveying Construction surveying Surveying
Land surveying Cadastral surveying Surveying
Military surveying Construction surveying and Military engineering Surveying
Surveying The process of surveying land Surveying Surveying
Surveying staff The construction and use of the surveying staff Level staff Surveying
Triangulation Triangulation Surveying
Anemology The forces that govern wind patterns Global wind patterns Theory
Delta formation The process of the formation of deltas at the mouths of rivers River delta § Formation Theory
Latitude climate zones Clime Theory
Origin of rainfall from evap condense The origin of rainfall through evaporation and condensation Evaporation and Condensation Theory
Water cycle A world-wide cycle involving precipitation, oceans, rivers, and other forms of water Water cycle Theory


Topic Description Wikipedia link Subdivision
Alternate history The exploration of how history would be different if some key past events had transpired differently Alternate history Form
Autobiographical adventure The method of writing a biography of oneself, particularly as it concerns a military campaign or adventure Autobiography Form
Biographical dictionaries The compilation of brief biographies into one large collection Biographical dictionary Form
Biography The method of writing the history of a single individual Biography Form
Comparative anthropology The method of comparing and contrasting different cultures Cross-cultural studies Form
Comparative biography The method of compiling several biographies to compare and contrast the subjects' character and to gain insight into history Biography Form
Cultural history The method of accurately and comprehensively describing cultures and civilizations Cultural history Form
Encyclopedia Encyclopedia Form
Genealogy The compilation of family lineages and methods of displaying them artfully Genealogy Form
Treatise on tech evolution Technological evolution Form
Archaeology The method of collecting and evaluating artifacts to learn about history and culture Archaeology Sourcing
Personal interviews Using personal interviews as sources Interview Sourcing
Role of cultural differences The role of cultural differences in source reliability and interpretation Cultural relativism Sourcing
Role of state bias and propaganda Propaganda Sourcing
Role of systemic bias Systemic bias Sourcing
Source reliability The reliability of sources Source criticism Sourcing
Historical causation The causes of historical events Causality § History Theory
Historical cycles The notion of historical, governmental and social cycles Cyclic history Theory
Social conflict Social conflict Theory
Sociology The notion of bonds between members of a community Sociology Theory


Topic Description Wikipedia link Subdivision
Divergence of harmonic series The divergence of the harmonic series Harmonic series (mathematics) Algebra
Equations The technique of balancing and completion for solving equations The Compendious Book on Calculation by Completion and Balancing, Algebra, and Equation Algebra
Large sums Simple formulas for certain arbitrarily large sums Summation Algebra
Pascal's triangle A triangular configuration of numbers relating to the successive powers of any sum Pascal's triangle Algebra
Quadratic by completing square The solving of quadratic equations by completion of the square Completing the square Algebra
Quadratic formula A formula which solves quadratic equations Quadratic formula Algebra
Solving higher order polynomials Methods for solving certain equations involving powers higher than the quadratic Galois theory Algebra
Systems of equations Methods of solving systems of equations Linear system Algebra
Area enclosed by line and parabola The area enclosed by a parabola and a line The Quadrature of the Parabola Geometry
Area of circle Area of a disk Geometry
Area of triangle from side lengths Heron's formula Geometry
Basic geometry Geometric objects: points, lines, circles, triangles, and so on Geometry Geometry
Chords The properties of chords Chord (geometry) Geometry
Chord tables A table of chord lengths indexed by angle Ptolemy's table of chords Geometry
Conic sections The categorization and properties of conic sections Conic section Geometry
Existence of pi The relationship between the area of a circle and its radius, involving the ratio of the circumference of the circle to its diameter Pi Geometry
Geometric mean The relationship between the length of the altitude of a right triangle and the lengths of the segments into which it divides the hypotenuse Geometric mean theorem Geometry
Inscribed triangle on diameter is right The angles of triangles inscribed in a circle with one edge on the diameter Thales' theorem Geometry
Irrational numbers The existence of incommensurable ratios Irrational number Geometry
Isosceles base angles equal The equality of the base angle of isosceles triangles Pons asinorum Geometry
Law of sines Law of sines Geometry
Pi to 6 digits Zu Chongzhi § Mathematics and Milü Geometry
Pythagorean theorem The relationship between the lengths of the hypotenuse of a right triangle and the other two sides Pythagorean theorem Geometry
Pythagorean triples 3 digit Examples of triples of large whole numbers which, when taken together, are the lengths of the sides of a right triangle Pythagorean triples Geometry
Pythagorean triples 4 digit Examples of triples of very large whole numbers which, when taken together, are the lengths of the sides of a right triangle Pythagorean triples Geometry
Pythagorean triples small Examples of triples of small whole numbers which, when taken together, are the lengths of the sides of a right triangle Pythagorean triples Geometry
Similar and congruent triangles The properties of similar and congruent triangles Similarity (geometry) and Congruence (geometry) Geometry
Sum-difference trig identities Trigonometric identities relating to the sums and differences of angles List of trigonometric identities § Angle sum and difference identities Geometry
Surface area of sphere The computation of the surface area of a sphere Sphere § Surface area Geometry
Volume of cone The computation of the volume of a cone Cone § Volume Geometry
Volume of pyramid The computation of the volume of different pyramids Pyramid (geometry) § Volume Geometry
Volume of sphere The computation of the volume of a sphere Sphere § Volume Geometry
Axioms Axiomatic reasoning Axiomatic system Method
Method of exhaustion An approximation of the ratio of a circumference of a circle to its diameter, using the area of polygons and the method of exhaustion Method of exhaustion Method
Proof by contradiction The method of proof by contradiction Proof by contradiction Method
Algebra Notation for abbreviating the unknown and other elements of an equation in a systematic and useful fashion Algebra Notation
Negative numbers Notation for negative quantities Negative number Notation
Place values Positional notation Positional notation Notation
Scientific notation Notation for very large numbers Scientific notation Notation
Symbol for addition The idea of using symbolic notation for addition Plus and minus signs § Plus sign Notation
Zero A symbol for nothingness 0 (number) Notation
Approximation of root 2 An approximation for the length of the diagonal of a square Square root of 2 § History Numbers
Chinese remainder algorithm An algorithm for computing a number which has given remainders when divided by several given primes Chinese remainder theorem Numbers
Division An algorithm for dividing one number into another, possibly yielding a remainder Euclidean division Numbers
Euclid's Theorem A proof that there are infinitely many prime numbers Euclid's theorem Numbers
Euclidean Algorithm An algorithm for computing the greatest common divisor of two numbers Euclidean algorithm Numbers
Irrationality of root 2 A proof that the length of a diagonal of a square is incommensurable with its edge Square root of 2 § Proofs of irrationality Numbers
Sieve algorithm for primes Sieve of Eratosthenes Numbers
Unique prime factorization The unique decomposition of a number into products of its prime divisors Fundamental theorem of arithmetic Numbers


Topic Description Wikipedia link Subdivision
Anesthesia Anesthesia Anesthesia Method
Asylum for mentally ill Psychiatric hospital Method
Autopsy Autopsy Method
Cataract surgery Cataract surgery Method
Cauterization Cauterization Cauterization Method
Fracture immobilization Bone fracture § Immobilization Method
Fracture treatment The treatment of fractures Bone fracture § Treatment Method
Hernia surgery Hernia surgery Hernia § Surgery Method
Hospital lab Medical laboratory Method
Lithotomy surgery The lithotomy surgery Lithotomy Method
Medical school Medical school Method
Physical examination The method of physical examination in diagnosing illness Physical examination Method
Professional hospital staff Surgeon and Physician Method
Specialized wards Hospital § Departments or wards Method
Tracheotomy surgery The tracheotomy surgery Tracheotomy Method
Traumatic injuries The treatment of traumatic injuries Major trauma Method
Draining The surgical method of draining Drain (surgery) Method (surgery)
Excision The surgical method of excision Excision Method (surgery)
Incision The surgical method of incision Surgical incision Method (surgery)
Ligature The surgical method of ligature Ligature (medicine) Method (surgery)
Probing The surgical method of probing Endoscopy Method (surgery)
Scraping The surgical method of scraping Debridement Method (surgery)
Suturing The surgical method of suturing Surgical suture Method (surgery)
Acute and chronic conditions The distinction between acute and chronic conditions Acute (medicine) and Chronic condition Theory
Anatomical studies Anatomical studies for medical edification Human body Theory
Blood vessels Blood vessel Theory
Classification of bodily fluids The classification of bodily fluids Body fluid or Humorism Theory
Classification of mental illnesses Mental disorder Theory
Classification of muscles Muscle Theory
Comparative anatomy Comparative anatomy Theory
Convalescence Convalescence Theory
Disease and fouled water The connection between disease and fouled water Waterborne diseases Theory
Endemic disease Endemic (epidemiology) Theory
Epidemic disease The theory of epidemic disease Epidemic Theory
Exacerbation The notion of the exacerbation of a patient's condition Exacerbation Theory
Eye anatomy The anatomy of the eye Human eye Theory
Fracture classification The classification of fractures Bone fracture § Classification Theory
Motor vs sensory nerves Motor nerve and Sensory nerve Theory
Nervous system function Nervous system Theory
Paroxysm The notion of paroxysm Paroxysmal attack Theory
Pathology The classification of disease Nosology Theory
Prognosis Determining the likely outcome given a patient's current status Prognosis Theory
Pulmonary circulation Pulmonary circulation Theory
Pulmonary medicine Pulmonary medicine Pulmonology Theory
Reaction time Mental chronometry Theory
Relapse Relapse Theory
Specialized surgical instruments The use of specialized surgical instruments Surgical instrument Theory
Surgical models The use of practice models in surgery Surgical planning Theory
The voice The source of the voice Phonation Theory
Toxicology The classification of toxic substances Toxicology Theory
Treatment of mental illnesses Treatment of mental disorders Theory
Animals as surgical models The use of animals as surgical models Vivisection Tool
Animal remedies Remedies prepared from animals Traditional Chinese medicine § Animal substances Tool
Bandages The method of bandaging wounds Bandage Tool
Dedicated hospitals Hospital Tool
Forceps Forceps Tool
Herbal remedies Herbal remedies Herbalism Tool
Mineral remedies Mineral remedies List of traditional Chinese medicines § Minerals Tool
Mud bags as surgical models The use of mud bags as surgical models Surgical planning Tool
Needles The construction and use of surgical needles Surgical suture § Needles Tool
Orthopedic cast Orthopedic cast Tool
Plants as surgical models Surgical planning Tool
Scalpel Scalpel Tool
Surgical scissors Surgical scissors Tool
Traction bench Hippocratic bench Tool


Topic Description Wikipedia link Subdivision
Dissection The dissection of creatures Dissection Method
Anatomy The anatomical study of creatures Anatomy Observation
Embryology The embriological development of creatures Embryology Observation
Foraging behavior The foraging behavior and diet of creatures Foraging Observation
Migration The migratory patterns of creatures Animal migration Observation
Reproductive behavior The reproductive behavior of creatures Reproduction Observation
Social behavior The social behavior of creatures Social behavior Observation
Veterinary medicine The diseases of creatures Veterinary medicine Observation
Climactic adaptation The way that creatures are suited to the climates in which they live Climatic adaptation Theory
Comparative anatomy Comparative anatomy Theory
Food chain Food chain Theory
Physical taxonomy The classification of creatures by their physical features Aristotle's biology § Classification Theory
Struggle for existence The struggle for survival among creatures Struggle for existence Theory


Topic Description Wikipedia link Subdivision
Nature of beauty Discourse on the nature of beauty Beauty (ancient thought) Aesthetics
Value of art Discourse on the value of art Aesthetics Aesthetics
Belief Discourse on the nature of belief Epistemology § Belief Epistemology
Justification Discourse on the nature of justification Epistemology § Justification Epistemology
Perception Discourse on the nature of perception Philosophy of perception Epistemology
Truth Discourse on the nature of truth Epistemology § Truth Epistemology
Individual value Discourse on the meaning of individual happiness Value (ethics) § Personal values Ethics
State consequentialism Discourse on ethics as it regards the benefit of the state State consequentialism Ethics
Interpersonal ethics Discourse on ethics as applied to interpersonal conduct Value (ethics) § Cultural values Ethics (applied)
Medical Discourse on medical ethics Medical ethics Ethics (applied)
Military Discourse on ethics as applied to war Ethics § Military ethics Ethics (applied)
Analogical inference Argument from analogy Logic
Deductive reasoning Deductive reasoning Deductive reasoning Logic
Dialectic reasoning Dialectic Logic
Direct inference Statistical syllogism Logic
Formal reasoning Formal reasoning Reason Logic
Hypothetical syllogisms Hypothetical syllogisms Hypothetical syllogism Logic
Inductive reasoning Inductive reasoning Logic
Propositional logic Propositional calculus Logic
Syllogistic logic Syllogistic logic Syllogism Logic
Causation The nature of causation Causality Metaphysics
Events Discourse on the nature of events Event (philosophy) Metaphysics
Existence Existence Metaphysics
Mind body Discourse on the nature of mind and body Mind–body problem Metaphysics
Objects and properties Essence Metaphysics
Processes Process philosophy Metaphysics
Time Discourse on the nature of time Time Metaphysics
Wholes and parts The relationship between wholes and parts Mereology Metaphysics
Education Education, its forms and recommendations Education Specialized
Law Discourse on law Law Specialized
Dictionary Dictionaries Dictionary Specialized (language)
Etymology The notion of etymology Etymology Specialized (language)
Grammar Grammar Grammar Specialized (language)
Diplomacy Discourse on diplomacy Diplomacy Specialized (politics)
Economic policy Discourse on economic policy Economic policy Specialized (politics)
Government forms Discourse on government Government Specialized (politics)
Social welfare Discourse on social welfare Welfare Specialized (politics)
Value agendas The philosopher will choose a belief that they have and write about the "worthlessness/nuances/value of (belief)". Reading these books will result in a dwarf's (or adventurer's) values changing. [1] [2] Propaganda n/a