Use the search form above to search for facts in the Kiddle encyclopedia (Kpedia). All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used for personal and educational purposes under Attribution-ShareAlike license, unless stated otherwise. K ids ask K iddle How did people wash their clothes before soap and detergent were widely available ? When did the first fast food restaurant open ? Do animals have dreams ? If my blood is red, why do my veins look blue ? How does rocket recovery work ? What happens if you fall into a Black hole ? What is 'nothing'? Can nothing actually exist ? Why do we have to sleep ? What happened before the Big Bang ? How many hearts does an octopus have ? Why do cats purr ? Why is the sky blue ? Where on Earth does the sun rise first every day ? Who is the richest person in the world ? August 2026 was the hottest month ever since measurements began. Scientists find first-ever footprints of a grown T.rex in North Dakota . OpenAI Unveils GPT-6 Astra , the closest AI yet to thinking like a human. Hubble Telescope spots a giant 10-sided wave swirling around Saturn 's south pole. NASA ’s Nancy Grace Roman Space Telescope launches toward Sun–Earth L2 orbit. A humanoid robot runs 100 meters in 9.39 seconds, beating Usain Bolt 's record of 9.58 seconds. Iceland votes "No" to joining the European Union . Astronomers have discovered the first black hole star — a Solar System -sized object in Cetus that outshines its entire host galaxy. The Long March 10B marked the first successful net-based rocket recovery ever achieved. M ind-blowing F acts When the Hubble Space Telescope first opened its robotic eyes in 1990, scientists were shocked to see that every picture came out blurry. What had gone wrong? Hubble's giant main mirror had been polished into the wrong shape by a mistake smaller than 1/50th the thickness of a human hair! That tiny error was too small to see, but it was big enough to keep light from focusing correctly. Who is the most portrayed literary character ever, according to the Guinness Book of World Records ? A 'yotta' is a super big number used in the metric system. How big is it exactly ? What is the Robin Hood tax ? Which part of the brain helps create your dreams ? Which plant that grows its yummy seeds underground is considered a "good luck charm" for NASA ? Imagine you have two identical clocks synchronized to tick at the exact same rate. If you leave one clock on Earth and put the other inside a super-fast spaceship, the two clocks will no longer match when the spaceship returns. Why ? Who is regarded as the first computer programmer ? What is the only bird with nostrils at the end of its beak ? Below is a list of some articles and categories to help you research different topics for school homework help , homeschooling and general education . K ids ask K iddle M ind-blowing F acts History Prehistory and ancient world Middle Ages and Early Modern Modern Prehistory and ancient world Middle Ages and Early Modern Biography Actors Artists Authors, playwrights and poets Composers and musicians Explorers and travelers Film directors and screenwriters Inventors, scientists and mathematicians Philosophers and social scientists Political leaders Religious figures and theologians Authors, playwrights and poets Composers and musicians Explorers and travelers Film directors and screenwriters Inventors, scientists and mathematicians Philosophers and social scientists Political leaders Religious figures and theologians Arts and recreation Architecture and civil engineering Film, radio and television Music Recreation Martial arts Olympic Games Architecture and civil engineering Film, radio and television Recreation Martial arts Olympic Games Science Astronomy Geology Biology Biological processes Organisms Anatomy Health and medicine Chemistry Earth science Physics Measurement and units Timekeeping Foodstuffs Beverages Mathematics Biology Biological processes Organisms Anatomy Health and medicine Biological processes Health and medicine Measurement and units Foodstuffs Beverages Technology Communication Electronics Computers and Internet Energy and fuels Materials Transportation Electronics Computers and Internet Computers and Internet Energy and fuels Philosophy and psychology Philosophy Psychology Religion World view and religion World view and religion Social sciences Geography Continents and major regions Countries Cities Bodies of water Mountains and mountain ranges Deserts Political Science Business and economics Law War and military Geography Continents and major regions Countries Cities Bodies of water Mountains and mountain ranges Deserts Continents and major regions Bodies of water Mountains and mountain ranges Political Science Business and economics War and military Language and literature Prehistory and ancient world Prehistory • Stone Age • Bronze Age • Iron Age • Mesopotamia • Ancient Egypt • Ancient Greece • Roman Empire • Han Dynasty • Gupta Empire Middle Ages and Early Modern Abbasid Caliphate • Age of Enlightenment • Aztec • Byzantine Empire • Crusades • Holy Roman Empire • Hundred Years' War • Middle Ages • Mongol Empire • Ming Dynasty • Ottoman Empire • Protestant Reformation • Thirty Years' War • Renaissance • Tang Dynasty • Vikings Arab-Israeli conflict • American Civil War • Apartheid • British Empire • Cold War • Cultural Revolution • French Revolution • Great Depression • The Holocaust • Industrial Revolution • Nazi Germany • Meiji Restoration • Russian Revolution • Qing Dynasty • Treaty of Versailles • Vietnam War • World War I • World War II Sarah Bernhardt • Charlie Chaplin • Leonardo DiCaprio • Tom Hanks • Meryl Streep • Ingrid Bergman • Henry Fonda

Salvador Dalí • Albrecht Dürer • Vincent van Gogh • Francisco de Goya • Frida Kahlo • Leonardo da Vinci • Henri Matisse • Michelangelo • Pablo Picasso • Raphael • Rembrandt • Peter Paul Rubens • Andy Warhol Authors, playwrights and poets Roald Dahl • Enid Blyton • C. S. Lewis • Hans Christian Andersen • Geoffrey Chaucer • Charles Dickens • William Shakespeare • Sophocles • Mark Twain Composers and musicians Louis Armstrong • Johann Sebastian Bach • The Beatles • Ludwig van Beethoven • Johannes Brahms • Frédéric Chopin • Antonín Dvořák • George Frideric Handel • Wolfgang Amadeus Mozart • Édith Piaf • Elvis Presley • Giacomo Puccini • Franz Schubert • Igor Stravinsky • Pyotr Ilyich Tchaikovsky • Giuseppe Verdi • Antonio Vivaldi • Richard Wagner • ABBA • Céline Dion • Michael Jackson • Dolly Parton • Ray Charles • John Williams • Louis Armstrong • Glenn Miller • John Lennon • Paul McCartney • Simon & Garfunkel • Eric Clapton • Keith Urban Explorers and travelers Roald Amundsen • Neil Armstrong • Jacques Cartier • Christopher Columbus • James Cook • Hernán Cortés • Yuri Gagarin • Vasco da Gama • Ibn Battuta • Ferdinand Magellan • Marco Polo Film directors and screenwriters Walt Disney • Alfred Hitchcock • Steven Spielberg • James Cameron • Peter Jackson • Russo brothers • Michael Bay • Christopher Nolan • Tim Burton • George Lucas • Clint Eastwood • David Yates • Ridley Scott • J. J. Abrams Inventors, scientists and mathematicians Archimedes • Avicenna • Tim Berners-Lee • Nicolaus Copernicus • Marie Curie • Charles Darwin • Thomas Edison • Albert Einstein • Euclid • Leonhard Euler • Michael Faraday • Enrico Fermi • Fibonacci • Henry Ford • Joseph Fourier • Galen • Galileo Galilei • Carl Friedrich Gauss • Johannes Gutenberg • James Prescott Joule • Johannes Kepler • Al-Khwarizmi • Gottfried Leibniz • Carl Linnaeus • James Clerk Maxwell • Dmitri Mendeleev • Isaac Newton • Louis Pasteur • Max Planck • Ernest Rutherford • Erwin Schrödinger • Nikola Tesla • Alan Turing • James Watt Philosophers and social scientists Aristotle • Noam Chomsky • Confucius • Sigmund Freud • John Maynard Keynes • Karl Marx • Plato • Jean-Jacques Rousseau • Jean-Paul Sartre • Socrates • Voltaire Political leaders Akbar the Great • Alexander the Great • Ashoka the Great • Mustafa Kemal Atatürk • Augustus • Otto von Bismarck • Simón Bolívar • Napoleon • Julius Caesar • Charlemagne • Winston Churchill • Constantine the Great • Cyrus the Great • Charles de Gaulle • Elizabeth I • Mahatma Gandhi • Genghis Khan • Che Guevara • Adolf Hitler • Joan of Arc • Martin Luther King Jr. • Vladimir Lenin • Abraham Lincoln • Louis XIV of France • Rosa Luxemburg • Nelson Mandela • Mao Zedong • Jawaharlal Nehru • Kwame Nkrumah • Peter the Great • Qin Shi Huang • Franklin D. Roosevelt • Saladin • Joseph Stalin • Suleiman the Magnificent • Sun Yat-sen • Tamerlane • Umar • George Washington Religious figures and theologians Abraham • Thomas Aquinas • Augustine of Hippo • Gautama Buddha • Al-Ghazali • Jesus • Martin Luther • Moses • Muhammad • Paul the Apostle Arts and recreation Culture • Art • Comics • Painting • Photography • Sculpture Architecture and civil engineering Architecture • Arch • Bridge • Canal • Dam • Dome • House • Burj Khalifa • Colosseum • Great Wall of China • Eiffel Tower • Empire State Building • Hagia Sophia • Parthenon • Giza pyramid complex • St. Peter's Basilica • Statue of Liberty • Taj Mahal • Three Gorges Dam • Pyramid • Tower Film, radio and television Film • Animation • Anime • Radio • Television Music • Song • Blues • Classical music • Opera • Symphony • Electronic music • Flamenco • Hip hop • Jazz • Reggae • Rock music • Samba • Accordion • Brass instrument • Alto saxophone • Bass guitar • Bass drum • Bassoon • Bongo • Carillon • Cello • Tubular bells • Clarinet • Contrabassoon • Cornet • Drum • Electric guitar • Electric piano • Synthesizer • Cor anglais • Euphonium • Flugelhorn • Flute • Horn (instrument) • Guitar • Harmonica • Harp • Harpsichord • Lyre • Oboe • Piano • Piccolo • Pipe organ • Recorder • Saxophone • Snare drum • Double bass • String instrument • Timpani • Trombone • Trumpet • Tuba • Vibraphone • Viola • Violin • Xylophone • Zither • Mandolin • Lute • Wind instrument • Woodwind instrument • Bagpipes • Percussion instrument • Cymbal Game • Backgammon • Chess • Go • Croquet • Horseshoes • Knucklebones • Paper football • Pinball • Snooker • Table football • Snakes and ladders • Backgammon • Dominoes • Scrabble • Tic-tac-toe • Sudoku • Charades Aikido • Borneo • Bujutsu • Iaido • Jujutsu • Jodo • Kempo • Kendo • Kyudo • Karate • Judo • Shorinji kenpo • Shotokan • Sumo • Taijutsu • Hapkido • Taekyun • Taekwondo • Tangsudo • Kali • Eskrima • Thai boxing • Kung-fu • Wushu • Taiji quan • Budokan Sport • Track and field • Auto racing • Basketball • Cricket • Association football • Golf • Rugby • Tennis • Rowing • Sailing • Surfing • Swimming • Skiing • Freestyle skiing • Ski jumping ) • Figure skating • Diving • Shooting • Boxing • Fencing • Wrestling • Softball • Badminton • American football • Australian Football • Canadian football • Polo • Volleyball • Gymnastics • Acrobatics • Motor sports • Bobsled • Toy Science • History of science • Knowledge • Nature • Experiment Astronomy • Asteroid • Big Bang • Black hole • Comet • Galaxy • Planet • Spaceflight • Star • Universe • Solar System • Moon • Earth • Jupiter • Mars • Mercury • Neptune • Saturn • Uranus • Venus • Sun Geology • Geomorphology • Historical geology • Hydrogeology • Palaeontology • Petrology • Mineralogy • Sedimentology • Stratigraphy • Structural geology • Volcanology • Seismology • Engineering geology • Petroleum geology Biology • Zoology • Ornithology • Mammalogy • Ichthyology • Herpetology • Microbiology • Biological materials • Biomolecule • Protein • Enzyme • Carbohydrates • Lipids • Nucleic acids • DNA • RNA • Botany • Agronomy • Biotechnology • Sustainable agriculture • Organic farms • Bryology • Forestry • Horticulture • Micropaleontology • Plant anatomy • Plant morphology • Phycology • Mycology • Ecology • Environmentalism • Biodiversity • Ecosystem • Habitat • Ecological niche • Keystone species • Sustainable development • Biome • Biosphere • Food chain • Endangered species • Domestication • Cattle • Horse • Sheep • Chicken • Pig • Domestic goat • Goose • Duck • Turkey (bird) • Pet • Goldfish • Hamster • Guinea pig • Cat • Dog • Parrot • Life • Birth • Evolution • Reproduction • Death • Biological classification • Taxonomy • Binomial nomenclature • Domain • Kingdom • Phylum • Class • Order • Family • Genus • Species Biological processes Metabolism • Digestion • Photosynthesis • Breathing • Evolution • Catabolism • Anabolism Organism • Archaea • Bacteria • Eukaryote • Animals • Arthropods • Insects • Ants • Bees • Mosquitoes • Beetle • Fly • Butterfly • Wasp • Hemiptera ] • Grasshopper • Dragonfly • Damselfly • Stick insect • Spiders • Black widow • Wolf spider • Goliath birdeater • Jumping spider • Tarantula • Sydney funnel-web spider • Crab • Shrimp • Millipede • Centipede • Amphibian • Frogs • Toads • Salamanders • Caecilians • Birds • Chicken • Pigeons and doves • Falcon • Starling • Crow • Owl • Tit • Finch • Heron • Cuckoo • Hawk • Eagle • Lark • Robin • Swift • Woodpecker • Sparrow • Jay • Condor • Gull • Stork • Fish • Ray • Shark • Tuna • Swordfish • Salmon • Cod • Mammal • Camel • Rodent • Rat • Mouse • Porcupine • Chipmunk • Squirrel • Beaver • Vole • Prairie dog • Chinchilla • Capybara • Primate • Strepsirrhini • Lemur • Galago • Lorisids • Haplorhini • Tarsiers • Monkeys • Baboons • Macaques • Capuchin monkeys • Tamarins • Apes • Gibbon • Siamang • Chimpanzee • Gorilla • Orangutan • Human • Homo habilis • Homo erectus • Homo habilis • Human evolution • Cetacea • Whales • Dolphins • Porpoises • Reptile • Dinosaur • Snake • Crocodile • Lizard • Turtle • Fungus • Algae • Plants • Flower • Tree • Herbs • Shrubs • Grasses • Vines • Ferns • Mosses • Green algae Anatomy • Cell • Circulatory system • Blood • Heart • Blood vessels • Arteries • Veins • Capillary • Endocrine system • Hypothalamus • Pineal gland • Pituitary gland • Thyroid • Adrenal gland • Parathyroid glands • Human gastrointestinal tract • Salivary gland • Esophagus • Pharynx • Stomach • Intestine • Large intestine • Colon • Cecum • Rectum • Small intestine • Duodenum • Jejunum • Ileum • Liver • Gallbladder • Pancreas • Tongue • Muscle • Nervous system • Central nervous system • Peripheral nervous system • Autonomic nervous system • Sympathetic nervous system • Parasympathetic nervous system • Somatic nervous system • Brain • Sensory system • Ear • Nose • Eye • Respiratory system • Lung • Diaphragm • Trachea • Bronchus • Bronchioles • Alveolus • Skeleton • Skin Health and medicine Medicine • Common cold • Dentistry • Disability • Blindness • Deafness • Disease • Health • Headache • Immune system • Antibiotics • Penicillin • Virus • Influenza Chemistry • Inorganic chemistry • Biochemistry • Chemical compound • Acid • Base (chemistry) • Salt • Chemical element • Periodic table • Aluminium • Carbon • Copper • Gold • Hydrogen • Iron • Nitrogen • Oxygen • Silver • Tin • Organic chemistry • Alcohol • Carbohydrate • Hormone • Lipid • Molecule • Analytical chemistry • Physical chemistry Avalanche • Climate • El Niño-Southern Oscillation • Global warming • Earthquake • Geology • Mineral • Plate tectonics • Rock • Natural disaster • Flood • Tsunami • Volcano • Weather • Cloud • Rain • Snow • Tornado • Tropical cyclone • Wind Physics • Acceleration • Atom • Energy • Conservation of energy • Electromagnetic radiation • Infrared • Ultraviolet • Light • Color • Classical mechanics • Force • Electromagnetism • Magnetic field • Gravitation • Strong interaction • Weak interaction • Magnet • Mass • Metal • Steel • Nuclear fission • State of matter • Gas • Liquid • Plasma • Solid • Quantum mechanics • Radioactive decay • General relativity • Special relativity • Semiconductor • Sound • Velocity • Speed of light • Temperature • Time • Thermodynamics • Vacuum Measurement and units Measurement • Kilogram • Litre • Metre • International System of Units • Second Calendar • Gregorian calendar • Julian calendar • Islamic calendar • Hebrew calendar • Clock • Day • Time zone • Year Food • Bread • Cereal • Barley • Maize • Oat • Rice • Rye • Sorghum • Wheat • Cheese • Chocolate • Honey • Fruit • Apple • Banana • Grape • Soybean • Lemon • Nut (fruit) • Meat • Sugar • Vegetable • Potato Beer • Coffee • Juice • Milk • Tea • Water • Wine Mathematics • Algebra • Logarithm • System of linear equations • Arithmetic • Addition • Division (mathematics) • Fractions • Multiplication • Percentage • Subtraction • Coordinate system • Equation • Function (mathematics) • Geometry • Angle • Area • Pi • Pythagorean theorem • Mathematical proof • Number • Complex number • Number theory • Infinity • Set theory • Statistics • Symmetry • Trigonometry Technology • Biotechnology • Clothing • Cotton • Engineering • Machine • Robot • Screw • Wheel • Agriculture • Irrigation • Plough • Metallurgy • Nanotechnology Communication • Book • Information • Encyclopedia • Journalism • Newspaper • Mass media • Printing • Telephone Electronics • Electric current • Frequency • Capacitor • Inductor • Transistor • Diode • Resistor • Transformer Computers and Internet Computer • Hard disk drive • Central processing unit • Artificial intelligence • Information technology • Algorithm • Internet • Email • World Wide Web • Operating system • Programming language • Software Energy and fuels Renewable energy • Electricity • Nuclear power • Fossil fuel • Internal combustion engine • Steam engine • Fire Glass • Paper • Plastic • Wood Transport • Aircraft • Automobile • Bicycle • Submarine • Ship • Train Philosophy and psychology Philosophy • Beauty • Dialectic • Ethics • Epistemology • Feminism • Free will • Knowledge • Consciousness • Logic • Mind • Probability • Reality • Truth Psychology • Behavior • Emotion • Love • Thought World view and religion God • Mythology • Atheism • Fundamentalism • Materialism • Monotheism • Polytheism • Soul • Religion • Buddhism • Christianity • Catholic Church • Confucianism • Hinduism • Trimurti • Islam • Shia Islam • Jainism • Judaism • Sikhism • Taoism • Zoroastrianism • Sufism • Yoga • Zen Social sciences Society • Child • Man • Marriage • Woman • Civilization • Anthropology • Archaeology Geography • City • Continent • Mountain • Desert • North Pole • Ocean • Rainforest • River • Sea • South Pole Continents and major regions Africa • Antarctica • Asia • Europe • Middle East • North America • Oceania • South America Afghanistan • Algeria • Argentina • Australia • Austria • Bangladesh • Brazil • Canada • China • Democratic Republic of the Congo • Cuba • Egypt • Ethiopia • France • Germany • India • Indonesia • Iran • Iraq • Israel • Italy • Japan • Mexico • Netherlands • New Zealand • Nigeria • Pakistan • Poland • Portugal • Russia • Saudi Arabia • Singapore • South Africa • South Korea • Spain • Sudan • Switzerland • Tanzania • Thailand • Turkey • Ukraine • United Kingdom • United States • Vatican City • Venezuela • Vietnam Amsterdam • Athens • Baghdad • Bangkok • Beijing • Berlin • Bogotá • Brussels • Buenos Aires • Cairo • Cape Town • Damascus • Delhi • Dhaka • Dubai • Hong Kong • Istanbul • Jakarta • Jerusalem • Karachi • Kinshasa • Kolkata • Lagos • London • Los Angeles • Madrid • Mecca • Mexico City • Moscow • Mumbai • Nairobi • New York City • Paris • Rio de Janeiro • Rome • Saint Petersburg • São Paulo • Seoul • Shanghai • Sydney • Tehran • Tokyo • Vienna • Washington, D.C. Bodies of water Amazon River • Arctic Ocean • Atlantic Ocean • Baltic Sea • Black Sea • Caribbean Sea • Caspian Sea • Congo River • Danube • Ganges • Great Barrier Reef • Great Lakes • Indian Ocean • Indus River • Lake Baikal • Lake Tanganyika • Lake Victoria • Mediterranean Sea • Mississippi River • Niger River • Nile • North Sea • Pacific Ocean • Panama Canal • Rhine • Suez Canal • Southern Ocean • Volga River • Yangtze River • Yellow River Mountains and mountain ranges Alps • Andes • Appalachian Mountains • Himalayas • Caucasus Mountains • American cordillera • Ural Mountains • Sierra Nevada • Rocky Mountains • Pyrenees • Mount Kilimanjaro • Denali • Mount Everest Desert • Sahara • Kalahari Desert • Patagonian Desert • Syrian Desert • Great Basin Desert • Gobi Desert • Arabian Desert Political Science Politics • Anarchism • Colonialism • Communism • Conservatism • Democracy • Dictatorship • Diplomacy • Fascism • Globalization • Government • Ideology • Imperialism • Liberalism • Marxism • Monarchy • Nationalism • Republic • Socialism Business and economics Economics • Microeconomics • Price • Supply and demand • Market • Macroeconomics • Gross domestic product • Tax • Unemployment • Inflation • Exchange rate • Interest • Economic growth • Production • Industry • Capital • Capitalism • Land • Business • Money • Currency • Euro • Yen • United States dollar • Peso • Pound • Ruble • Bolívar • Krone • Dinar • Yuan Law • Criminal law • Constitutional law • International law • Customary law • Tort law • Civil law • English law • Constitution • Rights • Jurisprudence • Rule of law War and military Military • Navy • Air force • Marines • Army • Infantry • Cavalry • Artillery • Military engineering • Peace • War • Cold War • Civil war • American Civil War • Spanish Civil War • English Civil War • Russian Civil War Language and literature Language • Constructed language • Dialect • Dictionary • Grammar • Adjective • Adverb • Conjunction • Grammatical case • Noun • Pronoun • Sentence • Syntax • Verb • Linguistics • Word • Phoneme • Syllable • Alphabet • Literacy • Writing • Literature • Prose • Fiction • Novel • Poetry In Spanish: Enciclopedia Kiddle para niños Suggest an edit .