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Science

Size planets comparison
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

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

Animal diversity
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

Atom diagram
A diagram of an atom based
  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-fumaroles-cyrus-read1
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

CollageFisica
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

Piles of Salt Salar de Uyuni Bolivia Luca Galuzzi 2006 a
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
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. Fraction (mathematics)
    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

Leonardo-Robot3
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

Petersdom von Engelsburg gesehen
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

  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 with doll
Charlie Chaplin shows off some of his merchandise, c. 1918.
  1. Bernhardt, Sarah
  2. Chaplin, Charlie
  3. DiCaprio, Leonardo
  4. Hanks, Tom
  5. Streep, Meryl
  6. Bergman, Ingrid
  7. Fonda, Henry

Artists

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

Authors, playwrights and poets

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

Composers and musicians

  1. Armstrong, Louis
  2. Bach, Johann Sebastian
  3. Beatles, The
  4. Beethoven, Ludwig van
  5. Brahms, Johannes
  6. Chopin, Frédéric
  7. Dvořák, Antonín
  8. Handel, Georg Frideric
  9. Mozart, Wolfgang Amadeus
  10. Piaf, Édith
  11. Presley, Elvis
  12. Puccini, Giacomo
  13. Schubert, Franz
  14. Stravinsky, Igor
  15. Tchaikovsky, Petr
  16. Verdi, Giuseppe
  17. Vivaldi, Antonio
  18. Wagner, Richard
  19. ABBA
  20. Celine 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

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

Film directors and screenwriters

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

Inventors, scientists and mathematicians

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

Philosophers and social scientists

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

Political leaders

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

Religious figures and theologians

  1. Abraham
  2. Aquinas, Thomas
  3. Augustine of Hippo
  4. Buddha
  5. Al-Ghazali
  6. Jesus
  7. Luther, Martin
  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

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