{"contentVersion":"when-v0","timelineStart":1400,"timelineEnd":2025,"events":[{"id":"battle-of-agincourt","prompt":"England’s Henry V defeats a far larger French army at Agincourt","subject":"Battle of Agincourt","year":1415,"precision":"year","category":"politics-world","context":"Fought on 25 October 1415 in the Hundred Years’ War; English longbowmen routed heavily armored French knights."},{"id":"joan-of-arc-orleans","prompt":"Joan of Arc lifts the English siege of Orléans","subject":"Siege of Orléans lifted","year":1429,"precision":"year","category":"politics-world","context":"The teenage Joan entered the besieged city in late April 1429; the siege broke on 8 May, turning the Hundred Years’ War."},{"id":"fall-of-constantinople","prompt":"Constantinople falls to the Ottoman Empire, ending the Byzantine Empire","subject":"Fall of Constantinople","year":1453,"precision":"year","category":"politics-world","context":"Mehmed II’s forces breached the ancient walls on 29 May 1453 after a 55-day siege."},{"id":"gutenberg-bible","prompt":"Gutenberg completes his printed Bible, the first great book from movable type in Europe","subject":"Gutenberg’s Bible","year":1455,"precision":"circa","category":"invention","context":"Completed about 1455 at Mainz; roughly 160-180 copies were printed, and dozens survive today."},{"id":"birth-of-venus","prompt":"Botticelli paints The Birth of Venus","subject":"The Birth of Venus","year":1485,"precision":"circa","category":"culture","context":"Painted in the mid-1480s on canvas for a Medici villa; now the centerpiece of the Uffizi in Florence."},{"id":"dias-cape-of-good-hope","prompt":"Bartolomeu Dias rounds the southern tip of Africa","subject":"Dias rounds Africa","year":1488,"precision":"year","category":"exploration","context":"The Portuguese navigator rounded the Cape in early 1488, opening the sea route toward Asia."},{"id":"columbus-reaches-americas","prompt":"Columbus makes landfall in the Americas","subject":"Columbus reaches Americas","year":1492,"precision":"year","category":"exploration","context":"On 12 October 1492 he stepped ashore on a Bahamian island he named San Salvador."},{"id":"da-gama-reaches-india","prompt":"Vasco da Gama becomes the first European to reach India by sea","subject":"Da Gama reaches India","year":1498,"precision":"year","category":"exploration","context":"He anchored off Calicut on 20 May 1498 after sailing around the Cape of Good Hope."},{"id":"last-supper-completed","prompt":"Leonardo da Vinci completes The Last Supper","subject":"The Last Supper","year":1498,"precision":"year","category":"culture","context":"Painted 1495-1498 on the refectory wall of Santa Maria delle Grazie in Milan — the same year da Gama reached India."},{"id":"mona-lisa-begun","prompt":"Leonardo da Vinci begins painting the Mona Lisa","subject":"Mona Lisa begun","year":1503,"precision":"circa","category":"culture","context":"Begun about 1503 in Florence; Leonardo kept the portrait with him until his death in 1519."},{"id":"david-unveiled","prompt":"Michelangelo’s statue of David is unveiled in Florence","subject":"Michelangelo’s David","year":1504,"precision":"year","category":"culture","context":"The 17-foot marble, carved 1501-1504, was unveiled in the Piazza della Signoria on 8 September 1504."},{"id":"sistine-ceiling","prompt":"Michelangelo’s Sistine Chapel ceiling is revealed to the public","subject":"Sistine Chapel ceiling","year":1512,"precision":"year","category":"culture","context":"Painted 1508-1512; first shown on 1 November 1512, including The Creation of Adam."},{"id":"luther-95-theses","prompt":"Martin Luther posts his Ninety-five Theses, sparking the Reformation","subject":"Luther’s theses","year":1517,"precision":"year","category":"politics-world","context":"Dated 31 October 1517 at Wittenberg, challenging the sale of indulgences."},{"id":"first-circumnavigation","prompt":"The first expedition to sail around the world returns to Spain","subject":"First circumnavigation","year":1522,"precision":"year","category":"exploration","context":"Magellan died en route; Elcano brought the Victoria home in September 1522 with just 18 survivors."},{"id":"copernicus-heliocentric","prompt":"Copernicus publishes his book placing the Sun at the center of the universe","subject":"Sun-centered universe","year":1543,"precision":"year","category":"science","context":"De revolutionibus appeared in 1543 as Copernicus lay dying, overturning the Earth-centered model."},{"id":"mercator-projection","prompt":"Mercator publishes the world map projection still used for navigation","subject":"Mercator projection","year":1569,"precision":"year","category":"science","context":"His 1569 world map let sailors plot straight compass courses for the first time."},{"id":"gregorian-calendar","prompt":"The Gregorian calendar is introduced, deleting ten days from October","subject":"Gregorian calendar","year":1582,"precision":"year","category":"everyday-life","context":"Pope Gregory XIII’s 1582 reform fixed the drifting Julian calendar; October 4 was followed by October 15."},{"id":"spanish-armada","prompt":"England defeats the Spanish Armada","subject":"Spanish Armada defeated","year":1588,"precision":"year","category":"politics-world","context":"The invasion fleet of about 130 ships was beaten at Gravelines in 1588 and wrecked sailing home."},{"id":"globe-theatre-opens","prompt":"Shakespeare’s Globe Theatre opens in London","subject":"Globe Theatre opens","year":1599,"precision":"year","category":"culture","context":"Built in 1599 on Bankside from the timbers of an older playhouse; Hamlet and Macbeth premiered there."},{"id":"jamestown-founded","prompt":"Jamestown, the first permanent English settlement in North America, is founded","subject":"Jamestown founded","year":1607,"precision":"year","category":"exploration","context":"About 100 Virginia Company colonists landed on the James River in May 1607 — 13 years before the Mayflower."},{"id":"galileo-starry-messenger","prompt":"Galileo publishes his first telescope discoveries, including the moons of Jupiter","subject":"Jupiter’s moons found","year":1610,"precision":"year","category":"science","context":"Sidereus Nuncius (1610) was the first published science based on telescope observations."},{"id":"mayflower-plymouth","prompt":"The Mayflower Pilgrims land at Plymouth","subject":"Mayflower at Plymouth","year":1620,"precision":"year","category":"exploration","context":"The Mayflower crossed with 102 passengers in late 1620; half the colonists died that first winter."},{"id":"shakespeare-first-folio","prompt":"Shakespeare’s collected plays are published as the First Folio","subject":"Shakespeare’s First Folio","year":1623,"precision":"year","category":"culture","context":"Published seven years after his death; without it, 18 plays including Macbeth might have been lost."},{"id":"taj-mahal-begun","prompt":"Construction of the Taj Mahal begins","subject":"Taj Mahal begun","year":1632,"precision":"year","category":"culture","context":"Shah Jahan began the mausoleum for Mumtaz Mahal in 1632; the complex took about two decades to finish."},{"id":"night-watch","prompt":"Rembrandt completes The Night Watch","subject":"The Night Watch","year":1642,"precision":"year","category":"culture","context":"The colossal Amsterdam militia portrait was finished in 1642, at the height of Rembrandt’s career."},{"id":"pendulum-clock","prompt":"Christiaan Huygens builds the first pendulum clock","subject":"First pendulum clock","year":1656,"precision":"year","category":"invention","context":"His 1656 design cut clock error from about 15 minutes a day to about 15 seconds."},{"id":"great-fire-of-london","prompt":"The Great Fire of London destroys most of the old city","subject":"Great Fire of London","year":1666,"precision":"year","category":"politics-world","context":"Starting in a Pudding Lane bakery in September 1666, it burned about 13,000 houses and old St Paul’s."},{"id":"leeuwenhoek-bacteria","prompt":"Van Leeuwenhoek reports seeing bacteria through his microscope, a first","subject":"Bacteria first seen","year":1676,"precision":"year","category":"science","context":"His 1676 letter to the Royal Society described ’animalcules’ — the beginning of microbiology."},{"id":"newton-principia","prompt":"Newton publishes the Principia, with his laws of motion and universal gravitation","subject":"Newton’s Principia","year":1687,"precision":"year","category":"science","context":"Published 5 July 1687 with Edmond Halley’s financial support."},{"id":"salem-witch-trials","prompt":"The Salem witch trials begin in Massachusetts","subject":"Salem witch trials","year":1692,"precision":"year","category":"politics-world","context":"More than 200 people were accused in 1692-93; nineteen were hanged."},{"id":"piano-invented","prompt":"Cristofori invents the piano in Florence","subject":"Piano invented","year":1700,"precision":"circa","category":"invention","context":"A 1700 Medici inventory lists his new harpsichord-like instrument with hammers — able to play soft and loud."},{"id":"mercury-thermometer","prompt":"Fahrenheit invents the mercury thermometer","subject":"Mercury thermometer","year":1714,"precision":"year","category":"invention","context":"Mercury’s properties made 1714’s instrument far more accurate; his temperature scale followed in 1724."},{"id":"encyclopedie-first-volume","prompt":"Diderot’s Encyclopédie publishes its first volume in Paris","subject":"Diderot’s Encyclopédie","year":1751,"precision":"year","category":"culture","context":"The Enlightenment’s great attempt to organize all knowledge began in 1751 and ran to 35 volumes."},{"id":"franklin-kite","prompt":"Benjamin Franklin flies a kite in a thunderstorm to show lightning is electricity","subject":"Franklin’s kite","year":1752,"precision":"year","category":"science","context":"Traditionally dated June 1752 in Philadelphia; Franklin described it in the Pennsylvania Gazette that October."},{"id":"halley-comet-returns","prompt":"Halley’s Comet returns just as Halley predicted, proving comets orbit the Sun","subject":"Halley’s comet return","year":1758,"precision":"year","category":"science","context":"First sighted on Christmas night 1758, sixteen years after Halley’s death — a triumph for Newtonian physics."},{"id":"britannica-first-edition","prompt":"The first Encyclopaedia Britannica begins publication in Edinburgh","subject":"First Britannica","year":1768,"precision":"year","category":"culture","context":"Issued in installments from December 1768, forming a three-volume set completed in 1771."},{"id":"watt-steam-patent","prompt":"James Watt patents his improved steam engine with a separate condenser","subject":"Watt’s steam engine","year":1769,"precision":"year","category":"invention","context":"The January 1769 patent cut coal use by two-thirds, powering the Industrial Revolution."},{"id":"cook-australia","prompt":"Captain Cook reaches and charts the east coast of Australia","subject":"Cook charts Australia","year":1770,"precision":"year","category":"exploration","context":"The Endeavour sighted the coast in April 1770 and anchored at Botany Bay on 29 April."},{"id":"declaration-of-independence","prompt":"The American Declaration of Independence is adopted","subject":"Independence declared","year":1776,"precision":"year","category":"politics-world","context":"Adopted by the Continental Congress on 4 July 1776, mainly drafted by Thomas Jefferson."},{"id":"uranus-discovered","prompt":"William Herschel discovers the planet Uranus","subject":"Uranus discovered","year":1781,"precision":"year","category":"science","context":"Spotted on 13 March 1781 from his garden in Bath — the first planet found with a telescope."},{"id":"first-balloon-flight","prompt":"Humans fly for the first time, aboard a Montgolfier hot-air balloon","subject":"First balloon flight","year":1783,"precision":"year","category":"invention","context":"Pilâtre de Rozier and the Marquis d’Arlandes flew over Paris for about 25 minutes on 21 November 1783."},{"id":"storming-of-bastille","prompt":"Parisians storm the Bastille, igniting the French Revolution","subject":"Storming of the Bastille","year":1789,"precision":"year","category":"politics-world","context":"On 14 July 1789 the crowd seized the fortress-prison, freeing its seven remaining prisoners."},{"id":"jenner-vaccination","prompt":"Edward Jenner performs the first vaccination, against smallpox","subject":"First vaccination","year":1796,"precision":"year","category":"science","context":"In May 1796 Jenner inoculated eight-year-old James Phipps with cowpox; ’vaccine’ comes from vacca, Latin for cow."},{"id":"first-parachute-jump","prompt":"André-Jacques Garnerin makes the first parachute jump","subject":"First parachute jump","year":1797,"precision":"year","category":"invention","context":"He cut loose from a balloon 2,000 feet over Paris on 22 October 1797 and landed shaken but unhurt."},{"id":"frankenstein-published","prompt":"Mary Shelley’s Frankenstein is published","subject":"Frankenstein published","year":1818,"precision":"year","category":"culture","context":"Published anonymously in January 1818, when Shelley was 20 — often called the first science-fiction novel."},{"id":"beethoven-ninth","prompt":"Beethoven’s Ninth Symphony premieres in Vienna","subject":"Beethoven’s Ninth","year":1824,"precision":"year","category":"culture","context":"Premiered 7 May 1824; the profoundly deaf composer stood on stage as the audience erupted."},{"id":"first-photograph","prompt":"Niépce captures the world’s first surviving photograph","subject":"First photograph","year":1826,"precision":"circa","category":"invention","context":"View from the Window at Le Gras, made in 1826 or 1827 with an exposure of many hours."},{"id":"braille-published","prompt":"Louis Braille publishes his raised-dot reading system for the blind","subject":"Braille published","year":1829,"precision":"year","category":"invention","context":"Braille was 20 when his code was first published in 1829; he refined it into its final form by 1837."},{"id":"first-intercity-railway","prompt":"The world’s first intercity passenger railway opens between Liverpool and Manchester","subject":"First intercity railway","year":1830,"precision":"year","category":"invention","context":"Opened 15 September 1830 with timetabled steam trains engineered by George Stephenson."},{"id":"penny-black","prompt":"The Penny Black, the world’s first postage stamp, goes on sale","subject":"Penny Black stamp","year":1840,"precision":"year","category":"everyday-life","context":"On sale from 1 May 1840, bearing the profile of 21-year-old Queen Victoria."},{"id":"fax-machine-patent","prompt":"Alexander Bain patents the first fax machine","subject":"Fax machine patented","year":1843,"precision":"year","category":"invention","context":"His patent of 27 May 1843 covered copying images by electric telegraph — 33 years before the telephone."},{"id":"morse-telegraph-message","prompt":"Samuel Morse sends the first official telegraph message: ’What hath God wrought’","subject":"Morse’s telegraph message","year":1844,"precision":"year","category":"invention","context":"Sent 24 May 1844 from the U.S. Capitol to Baltimore over the first commercial telegraph line."},{"id":"saxophone-patent","prompt":"Adolphe Sax patents the saxophone","subject":"Saxophone patented","year":1846,"precision":"year","category":"invention","context":"The 1846 patent covered a family of eight instruments — the same year Neptune was discovered."},{"id":"neptune-discovered","prompt":"The planet Neptune is discovered exactly where mathematics predicted","subject":"Neptune discovered","year":1846,"precision":"year","category":"science","context":"Galle found it on 23 September 1846, within one degree of Le Verrier’s calculated position."},{"id":"ether-anesthesia","prompt":"The first public demonstration of surgical anesthesia is performed with ether","subject":"Ether anesthesia demo","year":1846,"precision":"year","category":"science","context":"On 16 October 1846 at Massachusetts General Hospital, a tumor was removed painlessly — surgery changed forever."},{"id":"great-exhibition","prompt":"The Great Exhibition opens in London’s Crystal Palace","subject":"The Great Exhibition","year":1851,"precision":"year","category":"culture","context":"The first world’s fair opened 1 May 1851 in a giant glass hall; six million people visited."},{"id":"singer-sewing-machine","prompt":"Isaac Singer is granted the patent for his sewing machine","subject":"Singer’s sewing machine","year":1851,"precision":"year","category":"invention","context":"Patent 8,294, granted 12 August 1851, covered the first practical, efficient sewing machine."},{"id":"transatlantic-telegraph","prompt":"The first telegraph message crosses the Atlantic by undersea cable","subject":"Transatlantic telegraph","year":1858,"precision":"year","category":"invention","context":"Queen Victoria cabled President Buchanan in August 1858; the cable failed weeks later, but the ocean had been bridged."},{"id":"origin-of-species","prompt":"Darwin publishes On the Origin of Species","subject":"Origin of Species","year":1859,"precision":"year","category":"science","context":"Published 24 November 1859; the first printing sold out on day one."},{"id":"london-underground","prompt":"The world’s first underground railway opens in London","subject":"London Underground opens","year":1863,"precision":"year","category":"everyday-life","context":"The Metropolitan Railway opened 10 January 1863 and carried over 30,000 passengers on its first day."},{"id":"alice-in-wonderland","prompt":"Alice’s Adventures in Wonderland is published","subject":"Alice in Wonderland","year":1865,"precision":"year","category":"culture","context":"Lewis Carroll’s tale appeared in 1865 with John Tenniel’s illustrations."},{"id":"dynamite-patent","prompt":"Alfred Nobel patents dynamite","subject":"Dynamite patented","year":1867,"precision":"year","category":"invention","context":"His 1867 British patent tamed nitroglycerin for mining and construction; its fortune later funded the Nobel Prizes."},{"id":"suez-canal-opens","prompt":"The Suez Canal opens, linking the Mediterranean and Red Seas","subject":"Suez Canal opens","year":1869,"precision":"year","category":"invention","context":"Opened 17 November 1869 after ten years’ construction, cutting Europe-Asia voyages by thousands of miles."},{"id":"transcontinental-railroad","prompt":"The golden spike completes America’s first transcontinental railroad","subject":"Transcontinental railroad","year":1869,"precision":"year","category":"invention","context":"Driven at Promontory Summit, Utah, on 10 May 1869 — the same year the Suez Canal opened."},{"id":"periodic-table","prompt":"Mendeleev presents the periodic table of the elements","subject":"Periodic table","year":1869,"precision":"year","category":"science","context":"His 1869 table of 63 elements left deliberate gaps that correctly predicted undiscovered elements."},{"id":"yellowstone-park","prompt":"Yellowstone becomes the world’s first national park","subject":"First national park","year":1872,"precision":"year","category":"nature","context":"President Grant signed the act on 1 March 1872, protecting the geysers and wildlife from exploitation."},{"id":"blue-jeans-patent","prompt":"Levi Strauss and Jacob Davis are granted the patent for riveted blue jeans","subject":"Blue jeans patented","year":1873,"precision":"year","category":"everyday-life","context":"Granted 20 May 1873 for work pants reinforced with metal rivets — the birth of blue jeans."},{"id":"telephone-patent","prompt":"Alexander Graham Bell is granted the patent for the telephone","subject":"Telephone patented","year":1876,"precision":"year","category":"invention","context":"Patent 174,465 issued 7 March 1876; days later Bell called Watson through the first working telephone."},{"id":"first-wimbledon","prompt":"The first Wimbledon tennis championship is played","subject":"First Wimbledon","year":1877,"precision":"year","category":"sport","context":"22 men competed in July 1877 before about 200 spectators — the same year Edison invented the phonograph."},{"id":"phonograph-invented","prompt":"Edison invents the phonograph, the first machine to record and play back sound","subject":"Phonograph invented","year":1877,"precision":"year","category":"invention","context":"In its first test in 1877, Edison recorded himself reciting ’Mary had a little lamb.’"},{"id":"edison-light-demo","prompt":"Edison gives the first public demonstration of his incandescent light bulb","subject":"Edison’s light bulb","year":1879,"precision":"year","category":"invention","context":"On New Year’s Eve 1879 he lit up Menlo Park, New Jersey, with his carbon-filament lamps."},{"id":"brooklyn-bridge","prompt":"The Brooklyn Bridge opens as the world’s longest suspension bridge","subject":"Brooklyn Bridge opens","year":1883,"precision":"year","category":"invention","context":"Opened 24 May 1883; over 150,000 people crossed on the first day."},{"id":"krakatoa-eruption","prompt":"The volcanic island of Krakatoa erupts with the loudest sound in recorded history","subject":"Krakatoa erupts","year":1883,"precision":"year","category":"nature","context":"The August 1883 eruption destroyed most of the island and cooled global temperatures for years."},{"id":"first-skyscraper","prompt":"The world’s first steel-frame skyscraper is completed in Chicago","subject":"First skyscraper","year":1885,"precision":"year","category":"invention","context":"The ten-story Home Insurance Building (1885) used a revolutionary steel frame instead of load-bearing masonry."},{"id":"benz-motorwagen","prompt":"Karl Benz patents the first practical automobile","subject":"Benz’s automobile","year":1886,"precision":"year","category":"invention","context":"Patent 37435, applied for in January 1886, is often called the birth certificate of the car."},{"id":"coca-cola-first-sold","prompt":"The first glass of Coca-Cola is sold at an Atlanta pharmacy","subject":"First Coca-Cola sold","year":1886,"precision":"year","category":"everyday-life","context":"Pharmacist John Pemberton’s drink sold for five cents at Jacobs’ Pharmacy in May 1886 — the same year the Statue of Liberty was dedicated."},{"id":"statue-of-liberty","prompt":"The Statue of Liberty is dedicated in New York Harbor","subject":"Statue of Liberty","year":1886,"precision":"year","category":"culture","context":"France’s gift was dedicated by President Cleveland on 28 October 1886."},{"id":"sherlock-holmes-debut","prompt":"Sherlock Holmes appears in print for the first time","subject":"Sherlock Holmes debut","year":1887,"precision":"year","category":"culture","context":"A Study in Scarlet ran in Beeton’s Christmas Annual in 1887 — to little notice at the time."},{"id":"kodak-camera","prompt":"The first Kodak camera goes on sale, preloaded with roll film","subject":"First Kodak camera","year":1888,"precision":"year","category":"everyday-life","context":"George Eastman’s $25 camera came loaded with 100 exposures — photography for anyone who could press a button."},{"id":"eiffel-tower-opens","prompt":"The Eiffel Tower opens for the Paris World’s Fair","subject":"Eiffel Tower opens","year":1889,"precision":"year","category":"culture","context":"Built as the centerpiece of the 1889 Exposition; it was meant to stand only 20 years."},{"id":"starry-night","prompt":"Van Gogh paints The Starry Night","subject":"The Starry Night","year":1889,"precision":"year","category":"culture","context":"Painted in June 1889 from his asylum window at Saint-Rémy — the year the Eiffel Tower opened."},{"id":"basketball-invented","prompt":"James Naismith invents basketball with two peach baskets","subject":"Basketball invented","year":1891,"precision":"year","category":"sport","context":"Created in December 1891 at a Springfield, Massachusetts YMCA school to occupy students in winter."},{"id":"first-film-screening","prompt":"The Lumière brothers hold the first public film screening for a paying audience","subject":"First film screening","year":1895,"precision":"year","category":"culture","context":"Ten short films at Paris’s Grand Café on 28 December 1895 — the birth of cinema."},{"id":"xrays-discovered","prompt":"Röntgen discovers X-rays","subject":"X-rays discovered","year":1895,"precision":"year","category":"science","context":"Discovered 8 November 1895; weeks later he X-rayed his wife’s hand, wedding ring and all."},{"id":"first-modern-olympics","prompt":"The first modern Olympic Games open in Athens","subject":"First modern Olympics","year":1896,"precision":"year","category":"sport","context":"About 280 athletes from 12 nations competed in April 1896, reviving the ancient games."},{"id":"aspirin-trademarked","prompt":"Bayer trademarks Aspirin and begins selling it","subject":"Aspirin trademarked","year":1899,"precision":"year","category":"everyday-life","context":"Trademarked 6 March 1899; it was first sold as a powder in glass bottles."},{"id":"wright-first-flight","prompt":"The Wright brothers make the first powered airplane flight","subject":"Wright brothers’ flight","year":1903,"precision":"year","category":"invention","context":"At Kitty Hawk on 17 December 1903, the first flight lasted 12 seconds and covered 120 feet."},{"id":"einstein-special-relativity","prompt":"Einstein publishes his theory of special relativity","subject":"Special relativity","year":1905,"precision":"year","category":"science","context":"One of four revolutionary 1905 papers from his ’miracle year,’ leading to E=mc²."},{"id":"model-t-introduced","prompt":"Ford introduces the Model T","subject":"Ford Model T","year":1908,"precision":"year","category":"everyday-life","context":"Launched 1 October 1908; some 15 million were built, putting ordinary families on wheels."},{"id":"amundsen-south-pole","prompt":"Amundsen’s expedition becomes the first to reach the South Pole","subject":"South Pole reached","year":1911,"precision":"year","category":"exploration","context":"Reached 14 December 1911, five weeks ahead of Scott’s ill-fated British party."},{"id":"titanic-sinks","prompt":"The Titanic strikes an iceberg and sinks on its maiden voyage","subject":"Titanic sinks","year":1912,"precision":"year","category":"politics-world","context":"The liner sank in the North Atlantic on 15 April 1912; about 1,500 people died."},{"id":"panama-canal-opens","prompt":"The Panama Canal opens, connecting the Atlantic and Pacific","subject":"Panama Canal opens","year":1914,"precision":"year","category":"invention","context":"Opened 15 August 1914, overshadowed by the war that had just begun in Europe."},{"id":"last-passenger-pigeon","prompt":"Martha, the last passenger pigeon on Earth, dies at the Cincinnati Zoo","subject":"Last passenger pigeon","year":1914,"precision":"year","category":"nature","context":"She died 1 September 1914 — a species once numbering billions, gone within a human lifetime."},{"id":"first-supermarket","prompt":"Piggly Wiggly opens the first self-service grocery store","subject":"Piggly Wiggly opens","year":1916,"precision":"year","category":"everyday-life","context":"Opened September 1916 in Memphis: shoppers picked goods off open shelves for the first time."},{"id":"zipper-patent","prompt":"The modern zipper is patented as the ’separable fastener’","subject":"Zipper patented","year":1917,"precision":"year","category":"everyday-life","context":"Gideon Sundback’s patent was granted in March 1917; early zippers fastened soldiers’ boots and gear."},{"id":"first-transatlantic-flight","prompt":"Alcock and Brown make the first nonstop flight across the Atlantic","subject":"First transatlantic flight","year":1919,"precision":"year","category":"exploration","context":"They flew Newfoundland to Ireland in June 1919 — eight years before Lindbergh’s solo crossing."},{"id":"us-women-vote","prompt":"The 19th Amendment is ratified, guaranteeing American women the right to vote","subject":"Women’s suffrage ratified","year":1920,"precision":"year","category":"politics-world","context":"Ratified 18 August 1920 after generations of suffragist campaigning."},{"id":"insulin-first-used","prompt":"Insulin is used to treat a diabetic patient for the first time","subject":"Insulin first used","year":1922,"precision":"year","category":"science","context":"In January 1922, 14-year-old Leonard Thompson received the injections in Toronto; diabetes became survivable."},{"id":"tutankhamun-tomb","prompt":"Howard Carter discovers the tomb of Tutankhamun","subject":"Tutankhamun’s tomb","year":1922,"precision":"year","category":"exploration","context":"In November 1922 Carter peered in by candlelight and saw ’wonderful things’ — including the gold mask."},{"id":"first-tv-demonstration","prompt":"John Logie Baird gives the first public demonstration of television","subject":"Television demonstrated","year":1926,"precision":"year","category":"invention","context":"Shown 26 January 1926 in his London workshop to members of the Royal Institution."},{"id":"lindbergh-solo-atlantic","prompt":"Lindbergh flies solo nonstop from New York to Paris","subject":"Lindbergh’s solo flight","year":1927,"precision":"year","category":"exploration","context":"The Spirit of St. Louis covered 3,610 miles in 33.5 hours in May 1927."},{"id":"penicillin-discovered","prompt":"Alexander Fleming discovers penicillin in a moldy petri dish","subject":"Penicillin discovered","year":1928,"precision":"year","category":"science","context":"The chance observation of September 1928 launched the antibiotic age — the same year sliced bread went on sale."},{"id":"sliced-bread","prompt":"Sliced bread is sold for the first time","subject":"Sliced bread debut","year":1928,"precision":"year","category":"everyday-life","context":"Chillicothe, Missouri, July 1928, using Otto Rohwedder’s slicing machine; sales rose 2,000% in two weeks."},{"id":"steamboat-willie","prompt":"Mickey Mouse debuts in Steamboat Willie","subject":"Steamboat Willie","year":1928,"precision":"year","category":"culture","context":"Premiered 18 November 1928 in New York — the first cartoon hit with synchronized sound."},{"id":"empire-state-building","prompt":"The Empire State Building opens in New York","subject":"Empire State Building","year":1931,"precision":"year","category":"invention","context":"Opened 1 May 1931 after just over a year of construction; world’s tallest building for nearly 40 years."},{"id":"golden-gate-bridge","prompt":"The Golden Gate Bridge opens in San Francisco","subject":"Golden Gate Bridge","year":1937,"precision":"year","category":"invention","context":"200,000 people walked across on opening day, 27 May 1937."},{"id":"snow-white-premiere","prompt":"Disney’s Snow White, the first full-length cel-animated feature, premieres","subject":"Snow White premieres","year":1937,"precision":"year","category":"culture","context":"Premiered 21 December 1937 in Los Angeles; skeptics had called it ’Disney’s folly.’"},{"id":"nylon-stockings","prompt":"Nylon stockings go on sale across the United States","subject":"Nylon stockings","year":1940,"precision":"year","category":"everyday-life","context":"On ’Nylon Day’ in May 1940, four million pairs hit shelves and sold out within days."},{"id":"microwave-oven-patent","prompt":"Raytheon files the patent for the microwave oven","subject":"Microwave oven patent","year":1945,"precision":"year","category":"invention","context":"Filed October 1945 after a radar magnetron melted a chocolate bar in Percy Spencer’s pocket."},{"id":"transistor-invented","prompt":"The transistor is invented at Bell Labs","subject":"Transistor invented","year":1947,"precision":"year","category":"invention","context":"Bardeen, Brattain and Shockley’s December 1947 device became the building block of all modern electronics."},{"id":"sound-barrier-broken","prompt":"Chuck Yeager flies faster than the speed of sound, a first","subject":"Sound barrier broken","year":1947,"precision":"year","category":"exploration","context":"The Bell X-1 hit Mach 1.06 on 14 October 1947 — the same year the transistor was invented."},{"id":"polaroid-camera","prompt":"The first Polaroid instant camera goes on sale","subject":"First Polaroid camera","year":1948,"precision":"year","category":"everyday-life","context":"Edwin Land’s $89.75 camera sold out within minutes at a Boston department store in November 1948."},{"id":"dna-double-helix","prompt":"Watson and Crick reveal the double-helix structure of DNA","subject":"DNA double helix","year":1953,"precision":"year","category":"science","context":"Their 1953 Nature paper, built partly on Rosalind Franklin’s X-ray work, founded molecular biology."},{"id":"everest-first-summit","prompt":"Hillary and Tenzing Norgay become the first climbers to summit Everest","subject":"Everest first summited","year":1953,"precision":"year","category":"exploration","context":"They reached the top on 29 May 1953 — the same year DNA’s structure was announced."},{"id":"four-minute-mile","prompt":"Roger Bannister runs the first sub-four-minute mile","subject":"Four-minute mile","year":1954,"precision":"year","category":"sport","context":"3:59.4 at Oxford on 6 May 1954, breaking a barrier many thought physically impossible."},{"id":"disneyland-opens","prompt":"Disneyland opens in California","subject":"Disneyland opens","year":1955,"precision":"year","category":"culture","context":"Opened 17 July 1955 on former orange groves in Anaheim; a million visitors came in ten weeks."},{"id":"sputnik-launch","prompt":"The Soviet Union launches Sputnik, the first artificial satellite","subject":"Sputnik launch","year":1957,"precision":"year","category":"science","context":"Launched 4 October 1957, its beeping signal started the space race."},{"id":"lego-brick-patent","prompt":"The LEGO brick is patented","subject":"LEGO brick patented","year":1958,"precision":"year","category":"culture","context":"Patented 28 January 1958; bricks made that year still click into new ones today."},{"id":"barbie-debut","prompt":"The Barbie doll makes its debut at the New York Toy Fair","subject":"Barbie debut","year":1959,"precision":"year","category":"culture","context":"Introduced 9 March 1959 at $3; Mattel sold 300,000 in the first year."},{"id":"first-human-in-space","prompt":"Yuri Gagarin becomes the first human in space","subject":"First human in space","year":1961,"precision":"year","category":"exploration","context":"Vostok 1 orbited Earth once on 12 April 1961 in 108 minutes."},{"id":"i-have-a-dream","prompt":"Martin Luther King Jr. delivers his ’I Have a Dream’ speech","subject":"I Have a Dream","year":1963,"precision":"year","category":"politics-world","context":"Delivered 28 August 1963 at the Lincoln Memorial during the March on Washington."},{"id":"moon-landing","prompt":"First humans walk on the Moon","subject":"Moon landing","year":1969,"precision":"year","category":"exploration","context":"Apollo 11’s Armstrong and Aldrin stepped onto the surface on 20 July 1969."},{"id":"woodstock-festival","prompt":"The Woodstock music festival is held on a New York farm","subject":"Woodstock festival","year":1969,"precision":"year","category":"culture","context":"August 1969 in Bethel, NY — weeks after the Moon landing, in the same year as Concorde and the internet’s first message."},{"id":"concorde-first-flight","prompt":"Concorde, the supersonic airliner, makes its first flight","subject":"Concorde’s first flight","year":1969,"precision":"year","category":"invention","context":"First flew 2 March 1969; passenger service began in 1976 at twice the speed of sound."},{"id":"arpanet-first-message","prompt":"The first message is sent over ARPANET, the ancestor of the internet","subject":"First ARPANET message","year":1969,"precision":"year","category":"invention","context":"Sent from UCLA to Stanford Research Institute in late 1969 — the same year as the Moon landing and Woodstock."},{"id":"first-email","prompt":"The first email is sent between two computers, introducing the @ sign","subject":"First email sent","year":1971,"precision":"circa","category":"invention","context":"Ray Tomlinson’s 1971 program on ARPANET first sent mail between different machines."},{"id":"rubiks-cube-invented","prompt":"Ernő Rubik builds his first cube puzzle","subject":"Rubik’s Cube invented","year":1974,"precision":"year","category":"culture","context":"The Hungarian design teacher assembled his ’Magic Cube’ in 1974; it conquered the world in the early 1980s."},{"id":"star-wars-release","prompt":"The first Star Wars film is released","subject":"Star Wars released","year":1977,"precision":"year","category":"culture","context":"Released 25 May 1977 — the same summer the Voyager probes launched toward the outer planets."},{"id":"voyager-launch","prompt":"The twin Voyager space probes launch toward the outer planets","subject":"Voyager probes launch","year":1977,"precision":"year","category":"exploration","context":"Both launched in 1977 carrying the Golden Record; both are now in interstellar space."},{"id":"first-ivf-baby","prompt":"Louise Brown, the first baby conceived by IVF, is born","subject":"First IVF baby","year":1978,"precision":"year","category":"science","context":"Born 25 July 1978 in England; millions of IVF births have followed."},{"id":"pac-man-released","prompt":"Pac-Man is released in arcades","subject":"Pac-Man released","year":1980,"precision":"year","category":"culture","context":"Namco’s 1980 maze game became the best-known arcade game ever made."},{"id":"smallpox-eradicated","prompt":"Smallpox is declared eradicated worldwide","subject":"Smallpox eradicated","year":1980,"precision":"year","category":"science","context":"WHO’s 1980 declaration marked the first human disease ever wiped out — the same year Pac-Man appeared."},{"id":"compact-disc-launch","prompt":"The compact disc goes on sale","subject":"Compact disc launch","year":1982,"precision":"year","category":"invention","context":"Developed by Philips and Sony, CDs were commercially introduced in 1982."},{"id":"berlin-wall-falls","prompt":"The Berlin Wall falls","subject":"Berlin Wall falls","year":1989,"precision":"year","category":"politics-world","context":"On 9 November 1989 East Germany opened its borders and crowds broke through the Wall — the year the Web was proposed."},{"id":"www-proposed","prompt":"Tim Berners-Lee writes his proposal for the World Wide Web","subject":"World Wide Web proposal","year":1989,"precision":"year","category":"invention","context":"His March 1989 memo at CERN, ’Information Management: A Proposal,’ laid out the Web."},{"id":"hubble-launch","prompt":"The Hubble Space Telescope is launched into orbit","subject":"Hubble launched","year":1990,"precision":"year","category":"science","context":"Launched 24 April 1990; after a lens fix, it transformed our view of the universe."},{"id":"amazon-founded","prompt":"Jeff Bezos founds Amazon as an online bookstore","subject":"Amazon founded","year":1994,"precision":"year","category":"everyday-life","context":"Founded in 1994 in a Seattle garage; the website opened for business the next year."},{"id":"wolves-return-yellowstone","prompt":"Gray wolves are reintroduced to Yellowstone National Park","subject":"Yellowstone wolves return","year":1995,"precision":"year","category":"nature","context":"Fourteen Canadian wolves arrived in January 1995, ending a 70-year absence and reshaping the ecosystem."},{"id":"dolly-the-sheep","prompt":"Dolly the sheep, the first mammal cloned from an adult cell, is born","subject":"Dolly the sheep","year":1996,"precision":"year","category":"science","context":"Born in 1996 at Scotland’s Roslin Institute; her existence was announced in February 1997."},{"id":"harry-potter-published","prompt":"The first Harry Potter book is published","subject":"First Harry Potter book","year":1997,"precision":"year","category":"culture","context":"Harry Potter and the Philosopher’s Stone appeared in 1997 with a first print run of just 500 copies."},{"id":"google-founded","prompt":"Google is founded by two Stanford graduate students","subject":"Google founded","year":1998,"precision":"year","category":"invention","context":"Larry Page and Sergey Brin incorporated the search company in 1998."},{"id":"wikipedia-launch","prompt":"Wikipedia launches","subject":"Wikipedia launches","year":2001,"precision":"year","category":"culture","context":"Launched 15 January 2001 by Jimmy Wales and Larry Sanger — the same year the iPod appeared."},{"id":"ipod-launch","prompt":"Apple releases the first iPod","subject":"First iPod","year":2001,"precision":"year","category":"everyday-life","context":"The 2001 player promised ’a thousand songs in your pocket.’"},{"id":"human-genome-complete","prompt":"The Human Genome Project is completed","subject":"Human genome completed","year":2003,"precision":"year","category":"science","context":"Launched in 1990 and completed in April 2003, it produced the first sequence of the human genome."},{"id":"facebook-launch","prompt":"Facebook launches from a Harvard dorm room","subject":"Facebook launches","year":2004,"precision":"year","category":"everyday-life","context":"TheFacebook.com went live in February 2004, initially for Harvard students only."},{"id":"youtube-founded","prompt":"YouTube launches","subject":"YouTube launches","year":2005,"precision":"year","category":"everyday-life","context":"Registered in February 2005 and officially launched that December."},{"id":"iphone-release","prompt":"Apple releases the first iPhone","subject":"First iPhone","year":2007,"precision":"year","category":"everyday-life","context":"Released in the United States in 2007, redefining the phone as a touchscreen computer."},{"id":"bitcoin-launch","prompt":"The Bitcoin network launches","subject":"Bitcoin launches","year":2009,"precision":"year","category":"invention","context":"Created in 2009 by the pseudonymous Satoshi Nakamoto, following a 2008 white paper."},{"id":"minecraft-release","prompt":"Minecraft has its official full release","subject":"Minecraft full release","year":2011,"precision":"year","category":"culture","context":"Version 1.0 shipped 18 November 2011, after two years of public alpha and beta; it became the best-selling game ever."},{"id":"curiosity-mars-landing","prompt":"NASA’s Curiosity rover lands on Mars","subject":"Curiosity lands on Mars","year":2012,"precision":"year","category":"exploration","context":"The car-sized rover touched down 6 August 2012 via the ’sky crane’ maneuver — the year the Higgs boson was found."},{"id":"higgs-boson","prompt":"CERN announces the discovery of the Higgs boson","subject":"Higgs boson found","year":2012,"precision":"year","category":"science","context":"Announced 4 July 2012, confirming a particle predicted in 1964."},{"id":"pluto-flyby","prompt":"New Horizons makes the first close flyby of Pluto","subject":"Pluto flyby","year":2015,"precision":"year","category":"exploration","context":"Closest approach on 14 July 2015 revealed Pluto’s heart-shaped plain."},{"id":"gravitational-waves","prompt":"Physicists announce the first direct detection of gravitational waves","subject":"Gravitational waves","year":2016,"precision":"year","category":"science","context":"LIGO’s signal from two merging black holes (detected September 2015) was announced 11 February 2016, confirming Einstein’s century-old prediction."},{"id":"first-black-hole-image","prompt":"Astronomers release the first image of a black hole","subject":"First black hole image","year":2019,"precision":"year","category":"science","context":"The Event Horizon Telescope’s picture of M87’s black hole was unveiled 10 April 2019."},{"id":"webb-first-images","prompt":"The James Webb Space Telescope releases its first images of the deep universe","subject":"Webb’s first images","year":2022,"precision":"year","category":"science","context":"The first full-color images arrived 12 July 2022 — the same year ChatGPT launched."},{"id":"chatgpt-release","prompt":"OpenAI releases ChatGPT","subject":"ChatGPT released","year":2022,"precision":"year","category":"invention","context":"Released 30 November 2022, reaching a hundred million users within months."}]}