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Topic

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This article is about the current version of DF.
Note that some content may still need to be updated.


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).

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.

Astronomy

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

Chemistry

Topic Description Wikipedia link
Adhesives The preparation and use of adhesive materials Adhesive
Aqua regia The preparation of aqua regia Aqua regia
Spirit of niter The preparation of spirit of niter Nitric acid
Oil of vitriol The preparation of oil of vitriol Sulfuric acid
Alkali and acids The classification of alkali and acids pH
Combustibles The classification of combustible materials Combustibility
Elemental theory The classification of materials based on which elemental materials might form them Chemical element
Ores The classification of ores Ore
Scratch test Scratch hardness
Alembic The construction and use of the alembic Alembic
Blast furnace The construction and use of the blast furnace Blast furnace
Crucible The construction and use of the crucible Crucible
Ampoule The construction and use of the ampoule Ampoule
Beaker The construction and use of the beaker Beaker
Flask Flask
Funnel The construction and use of the funnel Funnel
Retort The construction and use of the retort Retort
Vial The construction and use of the vial Vial
Lab ovens The construction and use of laboratory ovens Laboratory oven
Systematic experiments Methods for performing experiments systematically in the laboratory Scientific method
Theory of distillation The theory and methods involved in distillation Distillation
Theory of evaporation The theory and methods involved in evaporation Evapotation
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
Alloys The mixture of metals to produce alloys Alloy

Engineering

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

Geography

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

History

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

Mathematics

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

Medicine

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

Naturalist

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

Philosophy

Topic Description Wikipedia link
Nature of beauty Discourse on the nature of beauty Beauty (ancient thought)
Value of art Aesthetics
Belief Discourse on the nature of belief Epistemology § Belief
Justification Discourse on the nature of justification Epistemology § Justification
Perception Discourse on the nature of perception Philosophy of perception
Truth Epistemology § Truth
Individual value Discourse on the meaning of individual happiness Value (ethics) § Personal values
State consequentialism Discourse on ethics as it regards the benefit of the state State consequentialism
Interpersonal Ethics Discourse on ethics as applied to interpersonal conduct
Medical Discourse on medical ethics Medical ethics
Military Discourse on ethics as applied to war Ethics § Military ethics
Analogical inference Argument from analogy
Deductive reasoning Deductive reasoning Deductive reasoning
Dialectic reasoning Dialectic
Direct inference Statistical syllogism
Formal reasoning Formal reasoning Reason
Hypothetical syllogisms Hypothetical syllogisms Hypothetical syllogism
Inductive reasoning Inductive reasoning
Propositional logic Propositional calculus
Syllogistic logic Syllogistic logic Syllogism
Causation The nature of causation Causality
Events Discourse on the nature of events Event (philosophy)
Existence Existence
Mind body Discourse on the nature of mind and body Mind–body problem
Objects and properties Essence
Processes Process philosophy
Time Discourse on the nature of time Time
Wholes and parts The relationship between wholes and parts Mereology
Education Education, its forms and recommendations Education
Dictionary Dictionaries Dictionary
Etymology The notion of etymology Etymology
Grammar Grammar Grammar
Law Discourse on law Law of sines
Diplomacy Discourse on diplomacy Diplomacy
Economic policy Discourse on economic policy Economic policy
Government forms Discourse on government Government
Social welfare Discourse on social welfare Welfare