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Science

The eight planets of the Solar System (by decreasing size) are Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars and Mercury.

1. Science
2. Nature

Astronomy

1. Astronomy
2. Asteroid
3. Big Bang
4. Black hole
5. Comet
6. Galaxy
   1. Milky Way
7. Moon
8. Planet
   1. Earth
   2. Jupiter
   3. Mars
   4. Mercury
   5. Neptune
   6. Saturn
   7. Uranus
   8. Venus
9. Solar System
10. Spaceflight
11. Star
    1. Sun
12. Universe

Geology

1. Geomorphology
2. Historical geology
3. Hydrogeology
4. Palaeontology
5. Petrology
6. Mineralogy
7. Sedimentology
8. Stratigraphy
9. Structural geology
10. Volcanology
11. Seismology
12. Engineering geology
13. Petroleum geology

Biology

1. Biology
2. Biological materials
   1. DNA
   2. Enzyme
   3. Protein
3. Botany
4. Ecology
   1. Endangered species
5. Domestication
6. Life
7. Biological classification
   1. Species

Biological processes

1. Metabolism
   1. Digestion
   2. Photosynthesis
   3. Breathing
2. Evolution

Organisms

A selection of diverse animal species

1. Organism
2. Animal
   1. Arthropod
      1. Insect
         1. Ant
         2. Bee
         3. Mosquito
      2. Spider
   2. Chordate
      1. Amphibian
         1. Frog
      2. Bird
         1. Chicken
         2. Pigeons and doves
      3. Fish
         1. Shark
      4. Mammal
         1. Camel
         2. Cat
         3. Cattle
         4. Dog
         5. Elephant
         6. Horse
         7. Sheep
         8. Rodent
         9. Domestic pig
         10. Primate
             1. Human
         11. Whales, dolphins and porpoises
      5. Reptile
         1. Dinosaur
         2. Snake
3. Archaea
4. Bacteria
5. Fungus
6. Plant
   1. Flower
   2. Tree
7. Protist

Anatomy

1. Anatomy
2. Cell
3. Circulatory system
   1. Blood
   2. Heart
4. Endocrine system
5. Human gastrointestinal tract
   1. Large intestine
   2. Small intestine
   3. Liver
6. Muscle
7. Nervous system
   1. Brain
   2. Sensory system
      1. Ear
      2. Nose
      3. Eye
8. Respiratory system
   1. Lung
9. Skeleton
10. Skin

Health and medicine

1. Medicine
2. Common cold
3. Dentistry
4. Disability
   1. Blindness
   2. Deafness
5. Disease
6. Health
7. Headache
8. Immune system
9. Antibacterial
   1. Penicillin
10. Virus
    1. Influenza

Chemistry

A diagram of an atom

1. Chemistry
2. Inorganic chemistry
3. Biochemistry
4. Chemical compound
   1. Acid
   2. Base (chemistry)
   3. Salt
5. Chemical element
   1. Periodic table
   2. Aluminium
   3. Carbon
   4. Copper
   5. Gold
   6. Hydrogen
   7. Iron
   8. Nitrogen
   9. Oxygen
   10. Silver
   11. Tin
6. Organic chemistry
   1. Alcohol
   2. Carbohydrate
   3. Hormone
   4. Lipid
7. Molecule
8. Analytical chemistry
9. Physical chemistry

Earth science

Fourpeaked volcano, Alaska, in September 2006 after being thought extinct for over 10,000 years

1. Avalanche
2. Climate
   1. El Niño-Southern Oscillation
   2. Global warming
3. Earthquake
4. Geology
   1. Mineral
      1. Diamond
   2. Plate tectonics
   3. Rock
5. Natural disaster
   1. Flood
   2. Tsunami
6. Volcano
7. Weather
   1. Cloud
   2. Rain
   3. Snow
   4. Tornado
   5. Tropical cyclone
   6. Wind

Physics

Various examples of physical phenomena

1. Physics
2. Acceleration
3. Atom
4. Energy
   1. Conservation of energy
5. Electromagnetic radiation
   1. Infrared
   2. Ultraviolet
   3. Light
      1. Color
6. Classical mechanics
7. Force
   1. Electromagnetism
      1. Magnetic field
   2. Gravitation
   3. Strong interaction
   4. Weak interaction
8. Magnet
9. Mass
10. Metal
    1. Steel
11. Nuclear fission
12. State of matter
    1. Gas
    2. Liquid
    3. Plasma
    4. Solid
13. Quantum mechanics
14. Radioactive decay
15. General relativity
16. Special relativity
17. Semiconductor
18. Sound
19. Velocity
    1. Speed of light
20. Temperature
21. Time
22. Thermodynamics
23. Vacuum

Measurement and units

1. Measurement
2. Kilogram
3. Litre
4. Metre
5. International System of Units
6. Second

Timekeeping

1. Calendar
   1. Gregorian calendar
2. Clock
3. Day
4. Time zone
5. Year

Foodstuffs

Salt mounds in Bolivia

1. Food
2. Bread
3. Cereal
   1. Barley
   2. Maize
   3. Oat
   4. Rice
   5. Rye
   6. Sorghum
   7. Wheat
4. Cheese
5. Chocolate
6. Honey
7. Fruit
   1. Apple
   2. Banana
   3. Grape
   4. Soybean
   5. Lemon
   6. Nut (fruit)
8. Meat
9. Sugar
10. Vegetable
    1. Potato

Beverages

1. Beer
2. Coffee
3. Juice
4. Milk
5. Tea
6. Water
7. Wine

Mathematics

Euclid (holding calipers), Greek mathematician, 3rd century BC, as imagined by Raphael in this detail from The School of Athens.

1. Mathematics
2. Algebra
   1. Logarithm
   2. System of linear equations
3. Arithmetic
   1. Addition
   2. Division (mathematics)
   3. Fractions
   4. Multiplication
   5. Percentage
   6. Subtraction
4. Coordinate system
5. Equation
6. Function (mathematics)
7. Geometry
   1. Angle
   2. Area
   3. Pi
   4. Pythagorean theorem
8. Mathematical proof
9. Number
   1. Complex number
   2. Number theory
10. Infinity
11. Set theory
12. Statistics
13. Symmetry
14. Trigonometry

Technology

Model of Leonardo's robot with inner workings. Possibly constructed by Leonardo da Vinci around the year 1495.

1. Technology
2. Biotechnology
3. Clothing
   1. Cotton
4. Engineering
   1. Machine
   2. Robot
   3. Screw
   4. Wheel
5. Agriculture
   1. Irrigation
   2. Plough
6. Metallurgy
7. Nanotechnology

Communication

1. Communication
2. Book
3. Information
   1. Encyclopedia
4. Journalism
   1. Newspaper
   2. Mass media
5. Printing
6. Telephone

Electronics

1. Electronics
   1. Electric current
   2. Frequency
2. Components
   1. Capacitor
   2. Inductor
   3. Transistor
   4. Diode
   5. Resistor
   6. Transformer

Computers and Internet

1. Computer
   1. Hard disk drive
   2. Central processing unit
2. Artificial intelligence
3. Information technology
   1. Algorithm
4. Internet
   1. Email
   2. World Wide Web
5. Operating system
6. Programming language
7. Software

Energy and fuels

1. Renewable energy
2. Electricity
   1. Nuclear power
3. Fossil fuel
4. Internal combustion engine
5. Steam engine
6. Fire

Materials

1. Glass
2. Paper
3. Plastic
4. Wood

Transportation

1. Transport
2. Aircraft
3. Automobile
4. Bicycle
5. Submarine
6. Ship
7. Train

Arts and recreation

1. Culture
2. Art
   1. Comics
   2. Painting
   3. Photography
   4. Sculpture
   5. Pottery
3. Dance
4. Fashion
5. Theatre
6. Calligraphy

Architecture and civil engineering

St. Peter's Basilica seen from Castel Sant' Angelo

1. Architecture
2. Arch
3. Bridge
4. Canal
5. Dam
6. Dome
7. House
8. Specific structures
   1. Burj Khalifa
   2. Colosseum
   3. Great Wall of China
   4. Eiffel Tower
   5. Empire State Building
   6. Hagia Sophia
   7. Parthenon
   8. Giza pyramid complex
   9. St. Peter's Basilica
   10. Statue of Liberty
   11. Taj Mahal
   12. Three Gorges Dam
9. Pyramid
10. Tower

Film, radio and television

1. Film
   1. Animation
      1. Anime
2. Radio
3. Television

Music

1. Music
2. Song
3. Specific music genres
   1. Blues
   2. Classical music
      1. Opera
      2. Symphony
   3. Electronic music
   4. Flamenco
   5. Hip hop
   6. Jazz
   7. Reggae
   8. Rock music
   9. Samba
4. Specific musical instruments

1. Accordion
2. Brass instrument
3. Alto_saxophone
4. Bass guitar
5. Bass drum
6. Bassoon
7. Bongo
8. Carillon
9. Cello
10. Tubular bells
11. Clarinet
12. Contrabassoon
13. Cornet
14. Drum
15. Electric guitar
16. Electric piano
17. Synthesizer
18. Cor anglais
19. Euphonium
20. Flugelhorn
21. Flute
22. Horn (instrument)
23. Guitar
24. Harmonica
25. Harp
26. Harpsichord
27. Lyre
28. Oboe
29. Piano
30. Piccolo
31. Pipe organ
32. Recorder
33. Saxophone
34. Snare drum
35. Double bass
36. String instrument
37. Timpani
38. Trombone
39. Trumpet
40. Tuba
41. Vibraphone
42. Viola
43. Violin
44. Xylophone
45. Zither
46. Mandolin
47. Lute
48. Wind instrument
49. Woodwind instrument
50. Bagpipes
51. Percussion instrument
52. Cymbal

Recreation

1. Game
   1. Backgammon
   2. Chess
   3. Go (game)
2. Martial arts
   1. Karate
   2. Judo
3. Olympic Games
4. Sport
   1. Track and field
   2. Auto racing
   3. Baseball
   4. Basketball
   5. Cricket
   6. Association football
   7. Golf
   8. Rugby
   9. Tennis
5. Toy

History and geography

History

1. History

Prehistory and ancient world

The Great Sphinx

1. Prehistory
2. Stone Age
3. Bronze Age
4. Iron Age
5. Mesopotamia
6. Ancient Egypt
7. Ancient Greece
8. Roman Empire
9. Han Dynasty
10. Gupta Empire

Middle Ages and Early Modern

1. Abbasid Caliphate
2. Age of Enlightenment
3. Aztec
4. Byzantine Empire
5. Crusades
6. Holy Roman Empire
7. Hundred Years' War
8. Middle Ages
9. Mongol Empire
10. Ming Dynasty
11. Ottoman Empire
12. Protestant Reformation
13. Thirty Years' War
14. Renaissance
15. Tang Dynasty
16. Vikings

Modern

1. Arab-Israeli conflict
2. American Civil War
3. Apartheid
4. British Empire
5. Cold War
6. Cultural Revolution
7. French Revolution
8. Great Depression
9. The Holocaust
10. Industrial Revolution
11. Nazi Germany
12. Meiji Restoration
13. Russian Revolution
14. Qing Dynasty
15. Treaty of Versailles
16. Vietnam War
17. World War I
18. World War II

Geography

This section is for geographical concepts and for specific places.

1. Geography
2. City
3. Continent
4. Mountain
5. Desert
6. North Pole
7. Ocean
8. Rainforest
9. River
10. Sea
11. South Pole

Continents and major regions

1. Africa
2. Antarctica
3. Asia
4. Europe
5. Middle East
6. North America
7. Oceania
8. South America

Countries

1. Afghanistan
2. Algeria
3. Argentina
4. Australia
5. Austria
6. Bangladesh
7. Brazil
8. Canada
9. China
10. Democratic Republic of the Congo
11. Cuba
12. Egypt
13. Ethiopia
14. France
15. Germany
16. India
17. Indonesia
18. Iran
19. Iraq
20. Israel
21. Italy
22. Japan
23. Mexico
24. Netherlands
25. New Zealand
26. Nigeria
27. Pakistan
28. Poland
29. Portugal
30. Russia
31. Saudi Arabia
32. Singapore
33. South Africa
34. South Korea
35. Spain
36. Sudan
37. Switzerland
38. Tanzania
39. Thailand
40. Turkey
41. Ukraine
42. United Kingdom
43. United States
44. Vatican City
45. Venezuela
46. Vietnam

Cities

1. Amsterdam
2. Athens
3. Baghdad
4. Bangkok
5. Beijing
6. Berlin
7. Bogotá
8. Brussels
9. Buenos Aires
10. Cairo
11. Cape Town
12. Damascus
13. Delhi
14. Dhaka
15. Dubai
16. Hong Kong
17. Istanbul
18. Jakarta
19. Jerusalem
20. Karachi
21. Kinshasa
22. Kolkata
23. Lagos
24. London
25. Los Angeles
26. Madrid
27. Mecca
28. Mexico City
29. Moscow
30. Mumbai
31. Nairobi
32. New York City
33. Paris
34. Rio de Janeiro
35. Rome
36. Saint Petersburg
37. São Paulo
38. Seoul
39. Shanghai
40. Sydney
41. Tehran
42. Tokyo
43. Vienna
44. Washington, D.C.

Bodies of water

1. Amazon River
2. Arctic Ocean
3. Atlantic Ocean
4. Baltic Sea
5. Black Sea
6. Caribbean Sea
7. Caspian Sea
8. Congo River
9. Danube
10. Ganges
11. Great Barrier Reef
12. Great Lakes
13. Indian Ocean
14. Indus River
15. Lake Baikal
16. Lake Tanganyika
17. Lake Victoria
18. Mediterranean Sea
19. Mississippi River
20. Niger River
21. Nile
22. North Sea
23. Pacific Ocean
24. Panama Canal
25. Rhine
26. Suez Canal
27. Southern Ocean
28. Volga River
29. Yangtze River
30. Yellow River

Mountains and deserts

1. Alps
2. Andes
3. Himalayas
   1. Mount Everest
4. Mount Kilimanjaro
5. Rocky Mountains
6. Sahara

Biography

Actors

Charlie Chaplin shows off some of his merchandise, c. 1918.

1. Sarah Bernhardt
2. Charlie Chaplin
3. Leonardo DiCaprio
4. Tom Hanks
5. Meryl Streep
6. Ingrid Bergman
7. Henry Fonda

Artists

1. Salvador Dalí
2. Albrecht Dürer
3. Vincent van Gogh
4. Francisco de Goya
5. Frida Kahlo
6. Leonardo da Vinci
7. Henri Matisse
8. Michelangelo
9. Pablo Picasso
10. Raphael
11. Rembrandt
12. Peter Paul Rubens
13. Andy Warhol

Authors, playwrights and poets

1. Roald Dahl
2. Enid Blyton
3. C. S. Lewis
4. Hans Christian Andersen
5. Geoffrey Chaucer
6. Charles Dickens
7. William Shakespeare
8. Sophocles
9. Mark Twain

Composers and musicians

1. Louis Armstrong
2. Johann Sebastian Bach
3. The Beatles
4. Ludwig van Beethoven
5. Johannes Brahms
6. Frédéric Chopin
7. Antonín Dvořák
8. George Frideric Handel
9. Wolfgang Amadeus Mozart
10. Édith Piaf
11. Elvis Presley
12. Giacomo Puccini
13. Franz Schubert
14. Igor Stravinsky
15. Pyotr Ilyich Tchaikovsky
16. Giuseppe Verdi
17. Antonio Vivaldi
18. Richard Wagner
19. ABBA
20. Céline Dion
21. Michael Jackson
22. Dolly Parton
23. Ray Charles
24. John Williams
25. Louis Armstrong
26. Glenn Miller
27. John Lennon
28. Paul McCartney
29. Simon & Garfunkel
30. Eric Clapton
31. Keith Urban

Explorers and travelers

Christopher Columbus

1. Roald Amundsen
2. Neil Armstrong
3. Jacques Cartier
4. Christopher Columbus
5. James Cook
6. Hernán Cortés
7. Yuri Gagarin
8. Vasco da Gama
9. Ibn Battuta
10. Ferdinand Magellan
11. Marco Polo

Film directors and screenwriters

1. Walt Disney
2. Alfred Hitchcock
3. Steven Spielberg

Inventors, scientists and mathematicians

1. Archimedes
2. Avicenna
3. Tim Berners-Lee
4. Nicolaus Copernicus
5. Marie Curie
6. Charles Darwin
7. Thomas Edison
8. Albert Einstein
9. Euclid
10. Leonhard Euler
11. Michael Faraday
12. Enrico Fermi
13. Fibonacci
14. Henry Ford
15. Joseph Fourier
16. Galen
17. Galileo Galilei
18. Carl Friedrich Gauss
19. Johannes Gutenberg
20. James Prescott Joule
21. Johannes Kepler
22. Al-Khwarizmi
23. Gottfried Leibniz
24. Carl Linnaeus
25. James Clerk Maxwell
26. Dmitri Mendeleev
27. Isaac Newton
28. Louis Pasteur
29. Max Planck
30. Ernest Rutherford
31. Erwin Schrödinger
32. Nikola Tesla
33. Alan Turing
34. James Watt

Philosophers and social scientists

1. Aristotle
2. Noam Chomsky
3. Confucius
4. Sigmund Freud
5. John Maynard Keynes
6. Karl Marx
7. Plato
8. Jean-Jacques Rousseau
9. Jean-Paul Sartre
10. Socrates
11. Voltaire

Political leaders

1. Akbar the Great
2. Alexander the Great
3. Ashoka the Great
4. Mustafa Kemal Atatürk
5. Augustus
6. Otto von Bismarck
7. Simón Bolívar
8. Napoleon
9. Julius Caesar
10. Charlemagne
11. Winston Churchill
12. Constantine the Great
13. Cyrus the Great
14. Charles de Gaulle
15. Elizabeth I
16. Mahatma Gandhi
17. Genghis Khan
18. Che Guevara
19. Adolf Hitler
20. Joan of Arc
21. Martin Luther King Jr.
22. Vladimir Lenin
23. Abraham Lincoln
24. Louis XIV of France
25. Rosa Luxemburg
26. Nelson Mandela
27. Mao Zedong
28. Jawaharlal Nehru
29. Kwame Nkrumah
30. Peter the Great
31. Qin Shi Huang
32. Franklin D. Roosevelt
33. Saladin
34. Joseph Stalin
35. Suleiman the Magnificent
36. Sun Yat-sen
37. Tamerlane
38. Umar
39. George Washington

Religious figures and theologians

1. Abraham
2. Thomas Aquinas
3. Augustine of Hippo
4. Gautama Buddha
5. Al-Ghazali
6. Jesus
7. Martin Luther
8. Moses
9. Muhammad
10. Paul the Apostle

Philosophy and psychology

Philosophy

1. Beauty
2. Dialectic
3. Ethics
4. Epistemology
5. Feminism
6. Free will
7. Knowledge
8. Logic
9. Mind
10. Philosophy
11. Probability
12. Reality
13. Truth

Psychology

1. Behavior
2. Emotion
3. Love
4. Psychology
5. Thought

Religion

World view and religion

1. God
2. Mythology
3. Worldview philosophies
   1. Atheism
   2. Fundamentalism
   3. Materialism
   4. Monotheism
   5. Polytheism
4. Soul
5. Religion
6. Specific religions
   1. Buddhism
   2. Christianity
      1. Catholic Church
   3. Confucianism
   4. Hinduism
      1. Trimurti
   5. Islam
      1. Shia Islam
   6. Jainism
   7. Judaism
   8. Sikhism
   9. Taoism
   10. Zoroastrianism
7. Spiritual practices
   1. Sufism
   2. Yoga
   3. Zen

Social sciences

1. Society
2. Civilization
3. Education

Family and relationships

1. Family
2. Child
3. Man
4. Marriage
5. Woman

Politics

1. Politics
2. Anarchism
3. Colonialism
4. Communism
5. Conservatism
6. Democracy
7. Dictatorship
8. Diplomacy
9. Fascism
10. Globalization
11. Government
12. Ideology
13. Imperialism
14. Liberalism
15. Marxism
16. Monarchy
17. Nationalism
18. Republic
19. Socialism

Business and economics

1. Economics
2. Capital
3. Capitalism
4. Currency
   1. Euro
   2. Japanese yen
   3. United States dollar
5. Industry
6. Money
7. Tax

Law

1. Law
2. Constitution

War and military

1. Civil war
2. Military
3. Peace
4. War

Language and literature

1. Language
2. Constructed language
3. Dialect
4. Dictionary
5. Grammar
   1. Adjective
   2. Adverb
   3. Conjunction
   4. Grammatical case
   5. Noun
   6. Pronoun
   7. Sentence
   8. Syntax
   9. Verb
6. Linguistics
7. Grammar
8. Word
   1. Phoneme
   2. Syllable
9. Alphabet
10. Literacy
11. Writing
12. Literature
    1. Prose
    2. Fiction
    3. Novel
    4. Poetry