Sources and checks

Every answer in Size Duel and Older Than was checked against two independent sources. Values were read from Wikidata (structured data under CC0) with the statement, rank and unit recorded, and compared with an independent source: a national encyclopedia (Store norske leksikon, Lex/Den Store Danske, Treccani, Hrvatska enciklopedija, Sapere.it, the Great Russian Encyclopedia), the Animal Diversity Web, NASA fact sheets, the US National Park Service, sports rule books or another official page. Where Wikidata had no matching value, two other sources were used. Each item page quotes the passage that was checked, in its original language, with the retrieval date.

The source pages were downloaded on 2026-10-19 by a server job and compared automatically (the quote must appear in the page), then read by Claude, the AI build agent that made this release. No human editorial review has been recorded yet. Values that sources disagree on are shown as ranges and only duel things outside that range; items whose “first” date is disputed (the first car, the first bicycle) were left out.

Measures and units

Values are stored in metres and kilograms and shown in metric, with imperial units as a setting. Animals use typical adult values with a range taken from the sources; planets and moons use their diameter; mountains use the height of the summit above sea level. Dates are years in the Gregorian calendar (before 1582 the year shown is the year the sources give; no day-level conversion is needed at year precision).

Every value

Item	Value	Wikidata	Other sources
Blue whale	about 25 m (82 ft)	Q42196	Animal Diversity Web, University of Michigan; Store norske leksikon
Blue whale	about 100 t (220,500 lb)	Q42196 (no value)	Store norske leksikon; NOAA Fisheries
Sperm whale (male)	about 16 m (52.5 ft)	Q81214 (no value)	Animal Diversity Web, University of Michigan; NOAA Fisheries
Humpback whale	about 15 m (49.2 ft)	Q132905	Store norske leksikon; Lex (Den Store Danske)
Orca (male)	about 8.5 m (27.9 ft)	Q26843 (no value)	Store norske leksikon; NOAA Fisheries
Great white shark	about 4.75 m (15.6 ft)	Q129026 (no value)	Lex (Den Store Danske); Animal Diversity Web, University of Michigan
Saltwater crocodile (male)	about 5 m (16.4 ft)	Q182599 (no value)	Store norske leksikon; National Geographic
Komodo dragon	about 2.5 m (8.2 ft)	Q4504 (no value)	Store norske leksikon; National Geographic
Polar bear (male)	about 2.4 m (7.87 ft)	Q33609 (no value)	Animal Diversity Web, University of Michigan; Store norske leksikon
Polar bear (male)	about 450 kg (992 lb)	Q33609	Animal Diversity Web, University of Michigan; Store norske leksikon
Capybara	about 1.2 m (3.94 ft)	Q131538 (no value)	Animal Diversity Web, University of Michigan; Store norske leksikon
Capybara	about 49 kg (108 lb)	Q131538	Animal Diversity Web, University of Michigan; Store norske leksikon
Platypus	about 46.5 cm (1.53 ft)	Q15343 (no value)	Animal Diversity Web, University of Michigan; Lex (Den Store Danske)
Bee hummingbird	about 58 mm (2.28 in)	Q213036 (no value)	Animal Diversity Web, University of Michigan; Store norske leksikon
Bee hummingbird	about 2.28 g (0.0804 oz)	Q213036 (no value)	Animal Diversity Web, University of Michigan; Store norske leksikon
Giraffe	about 5 m (16.4 ft)	Q862089 (no value)	Hrvatska enciklopedija; National Geographic
Giraffe	about 1.2 t (2,646 lb)	Q862089 (no value)	Hrvatska enciklopedija; National Geographic
Emperor penguin	about 1.12 m (3.67 ft)	Q161829 (no value)	Store norske leksikon; National Geographic
Gorilla (male)	about 1.7 m (5.58 ft)	Q36611 (no value)	Store norske leksikon; Treccani Enciclopedia online
Hippopotamus	about 1.5 t (3,307 lb)	Q34505 (no value)	Animal Diversity Web, University of Michigan; National Geographic
Moose (male)	about 500 kg (1,102 lb)	Q35517 (no value)	Animal Diversity Web, University of Michigan; Lex (Den Store Danske)
Human red blood cell	about 7.5 µm	Q37187	Sapere.it encyclopedia (De Agostini)
The Moon	3,475 km (2,159 mi)	Q405	NASA NSSDCA planetary fact sheet; Lex (Den Store Danske)
The Moon	7.35 × 10²² kg	Q405	NASA NSSDCA planetary fact sheet; Lex (Den Store Danske)
Earth	12,742 km (7,918 mi)	Q2	NASA NSSDCA planetary fact sheet; Store norske leksikon
Earth	5.97 × 10²⁴ kg	Q2	NASA NSSDCA planetary fact sheet; Lex (Den Store Danske)
Mars	6,779 km (4,212 mi)	Q111 (no value)	NASA NSSDCA planetary fact sheet; Store norske leksikon
Mars	6.42 × 10²³ kg	Q111	NASA NSSDCA planetary fact sheet
Jupiter	142,984 km (88,850 mi)	Q319	NASA NSSDCA planetary fact sheet
Jupiter	1.9 × 10²⁷ kg	Q319	NASA NSSDCA planetary fact sheet
The Sun	1,392,000 km (864,900 mi)	Q525 (no value)	Store norske leksikon; Lex (Den Store Danske)
The Sun	1.99 × 10³⁰ kg	Q525	NASA NSSDCA planetary fact sheet; Lex (Den Store Danske)
Pluto	2,376 km (1,476 mi)	Q339	Store norske leksikon; Lex (Den Store Danske)
Pluto	1.3 × 10²² kg	Q339	NASA NSSDCA planetary fact sheet; Lex (Den Store Danske)
Ceres	940 km (584.1 mi)	Q596	Store norske leksikon; NASA Science
Mercury	4,879 km (3,032 mi)	Q308	NASA NSSDCA planetary fact sheet; Store norske leksikon
Mercury	3.3 × 10²³ kg	Q308	NASA NSSDCA planetary fact sheet
Venus	12,104 km (7,521 mi)	Q313	NASA NSSDCA planetary fact sheet
Ganymede	5,262 km (3,270 mi)	Q3169 (no value)	Store norske leksikon; Lex (Den Store Danske)
Titan	5,150 km (3,200 mi)	Q2565 (no value)	Store norske leksikon; NASA NSSDCA planetary fact sheet
Europa	3,122 km (1,940 mi)	Q3143 (no value)	Store norske leksikon; Lex (Den Store Danske)
Grand Canyon	446 km (277.1 mi)	Q118841	Store norske leksikon
Great Barrier Reef	2,300 km (1,429 mi)	Q7343	Store norske leksikon
Channel Tunnel	50.5 km (31.35 mi)	Q10257	Store norske leksikon
Seikan Tunnel	53.9 km (33.46 mi)	Q99250	Store norske leksikon; Sapere.it encyclopedia (De Agostini)
Gotthard Base Tunnel	57.1 km (35.47 mi)	Q193002	Store norske leksikon
Panama Canal	82 km (50.95 mi)	Q7350	Store norske leksikon; Lex (Den Store Danske)
Suez Canal	193 km (120.1 mi)	Q899	Store norske leksikon; Hrvatska enciklopedija
Lake Baikal	636 km (395.2 mi)	Q5513	Hrvatska enciklopedija
Strait of Gibraltar	60 km (37.28 mi)	Q36124	Store norske leksikon; Lex (Den Store Danske)
A marathon	42.195 km (26.22 mi)	Q40244 (no value)	Store norske leksikon; World Athletics
Akashi Kaikyō Bridge	3.911 km (12,830 ft)	Q184213	Store norske leksikon
Øresund Bridge	7.845 km (25,740 ft)	Q297871	Store norske leksikon
Tower Bridge	244 m (801 ft)	Q83125	Store norske leksikon
RMS Titanic	269.1 m (883 ft)	Q25173	Store norske leksikon
RMS Titanic	52,310 t (115 million lb)	Q25173	Lex (Den Store Danske)
Hindenburg airship	245 m (804 ft)	Q217964	Store norske leksikon
Concorde	61.66 m (202 ft)	Q6505	Store norske leksikon; Hrvatska enciklopedija
Airbus A380	72.72 m (239 ft)	Q5830	Store norske leksikon
International Space Station	109 m (358 ft)	Q25271 (no value)	Lex (Den Store Danske); NASA
International Space Station	420 t (925,300 lb)	Q25271	NASA; Lex (Den Store Danske)
Hubble Space Telescope	13.3 m (43.5 ft)	Q2513	Store norske leksikon
Curiosity rover	3 m (9.84 ft)	Q48485	NASA Science
Curiosity rover	899 kg (1,982 lb)	Q48485	NASA Science
Wright Flyer (1903)	6.4 m (21 ft)	Q688605	Store norske leksikon; Smithsonian National Air and Space Museum
Eiffel Tower	330 m (1,083 ft)	Q243	Store norske leksikon; Lex (Den Store Danske)
Statue of Liberty	93 m (305 ft)	Q9202 (no value)	US National Park Service; Lex (Den Store Danske)
Great Pyramid of Giza	139 m (454 ft)	Q37200	Store norske leksikon; Lex (Den Store Danske)
Elizabeth Tower (Big Ben)	96 m (315 ft)	Q41225	Lex (Den Store Danske); Store norske leksikon
Leaning Tower of Pisa	about 58.4 m (191 ft)	Q39054	Opera della Primaziale Pisana (official site); Lex (Den Store Danske)
Burj Khalifa	828 m (2,717 ft)	Q12495	Store norske leksikon; Lex (Den Store Danske)
Colosseum	48.5 m (159 ft)	Q10285	Store norske leksikon; Lex (Den Store Danske)
Washington Monument	169 m (555 ft)	Q178114	US National Park Service; US National Park Service
Arc de Triomphe	49.5 m (163 ft)	Q64436	Lex (Den Store Danske)
Atomium	102 m (335 ft)	Q180901	Lex (Den Store Danske)
Cologne Cathedral	157 m (515 ft)	Q4176	Lex (Den Store Danske)
St. Peter’s Basilica	137 m (448 ft)	Q12512	Store norske leksikon; Lex (Den Store Danske)
Petronas Towers	452 m (1,483 ft)	Q83063	Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Taipei 101	508 m (1,667 ft)	Q83101	Store norske leksikon
London Eye	135 m (443 ft)	Q160659	Store norske leksikon
Berlin TV Tower	368 m (1,207 ft)	Q151356	Store norske leksikon
Ostankino Tower	540 m (1,772 ft)	Q181324	Store norske leksikon
Willis Tower	442 m (1,450 ft)	Q29294	Store norske leksikon
CN Tower	553.3 m (1,815 ft)	Q134883	Store norske leksikon
Tokyo Skytree	634 m (2,080 ft)	Q57965	en.tokyo-skytree.jp
Golden Gate Bridge tower	227 m (745 ft)	Q44440	Store norske leksikon
Uluru	348 m (1,142 ft)	Q33910 (no value)	Store norske leksikon; Lex (Den Store Danske)
General Sherman tree	83.8 m (275 ft)	Q152482	US National Park Service
Mount Everest	8,849 m (29,030 ft)	Q513	Hrvatska enciklopedija; Store norske leksikon
K2	8,611 m (28,250 ft)	Q43512	Lex (Den Store Danske); Store norske leksikon
Mount Kilimanjaro	5,895 m (19,340 ft)	Q7296	Store norske leksikon; Treccani Enciclopedia online
Mont Blanc	4,808 m (15,770 ft)	Q583	Store norske leksikon; Lex (Den Store Danske)
Mount Fuji	3,776 m (12,390 ft)	Q39231	Store norske leksikon; Lex (Den Store Danske)
Ben Nevis	1,345 m (4,413 ft)	Q104674	Store norske leksikon; Hrvatska enciklopedija
Denali	6,190 m (20,310 ft)	Q130018	Store norske leksikon; Lex (Den Store Danske)
Aconcagua	6,962 m (22,840 ft)	Q39739	Store norske leksikon; Sapere.it encyclopedia (De Agostini)
Matterhorn	4,478 m (14,690 ft)	Q1374	Store norske leksikon; Lex (Den Store Danske)
Table Mountain	1,085 m (3,560 ft)	Q213360	Store norske leksikon
Mount Olympus	2,918 m (9,573 ft)	Q80344	Lex (Den Store Danske); Treccani Enciclopedia online
Mount Vesuvius	1,281 m (4,203 ft)	Q524	Store norske leksikon; Hrvatska enciklopedija
Mauna Kea	4,207 m (13,800 ft)	Q131230	Store norske leksikon; Lex (Den Store Danske)
Mount Elbrus	5,642 m (18,510 ft)	Q43105	Store norske leksikon; Lex (Den Store Danske)
Zugspitze	2,962 m (9,718 ft)	Q3375	Store norske leksikon; Lex (Den Store Danske)
Mount Teide	3,715 m (12,190 ft)	Q38954	Store norske leksikon; Lex (Den Store Danske)
Mount Rainier	4,392 m (14,410 ft)	Q194057	US National Park Service
Mount Kenya	5,199 m (17,060 ft)	Q172070	Store norske leksikon; Lex (Den Store Danske)
Tennis ball	about 67 mm (2.64 in)	Q246514	ITF Technical Booklet 2023 (Rules of Tennis, Appendix I)
Tennis ball	about 57.6 g (2.03 oz)	Q246514	ITF Technical Booklet 2023 (Rules of Tennis, Appendix I)
Football (size 5)	22 cm (8.66 in)	Q12252328	IFAB Laws of the Game, Law 2
Football (size 5)	about 430 g (15.2 oz)	Q12252328	IFAB Laws of the Game, Law 2
Basketball (size 7)	about 24.2 cm (9.53 in)	Q810345	Store norske leksikon; Treccani Enciclopedia online
Basketball (size 7)	about 600 g (1.32 lb)	Q810345	Store norske leksikon; Treccani Enciclopedia online
Table tennis ball	2.7 g (0.0952 oz)	Q3930 (no value)	Store norske leksikon; Lex (Den Store Danske)
Cricket ball (men’s)	about 159 g (5.62 oz)	Q1139973	Store norske leksikon; MCC Laws of Cricket, Law 4
1 euro coin	23.25 mm (0.915 in)	Q684722	European Central Bank: euro coins
1 euro coin	7.5 g (0.265 oz)	Q684722	European Central Bank: euro coins
1 cent euro coin	16.25 mm (0.64 in)	Q1815386	European Central Bank: euro coins
1 cent euro coin	2.3 g (0.0811 oz)	Q1815386	European Central Bank: euro coins
Cricket pitch	20.1 m (66 ft)	Q1210687	MCC Laws of Cricket, Law 6
Football pitch (international)	about 105 m (344 ft)	Q8524	IFAB Laws of the Game, Law 1

Every date

Item	Date	Wikidata	Other sources
Telephone (Bell’s patent)	patented 1876	Q11035	Lex (Den Store Danske)
Fax machine (first patent)	patented 1843	Q132744	Store norske leksikon
Phonograph	invented 1877	Q116434	Store norske leksikon; Lex (Den Store Danske)
Microwave cooking	discovered 1945	Q127956	Store norske leksikon
Ballpoint pen (first patent)	patented 1888	Q160137	Store norske leksikon
Sudoku	first published 1979	Q44914	Lex (Den Store Danske)
Jigsaw puzzle	first made c. 1760	Q181008	Lex (Den Store Danske)
Traffic light	first installed 1868	Q8004	Store norske leksikon; Lex (Den Store Danske)
Electric battery (Volta’s pile)	invented 1800	Q663273	Store norske leksikon; Lex (Den Store Danske)
Dynamite	invented 1867	Q80728	Store norske leksikon; Lex (Den Store Danske)
Computer mouse	invented 1963	Q7987	Store norske leksikon; Lex (Den Store Danske)
Barometer	invented 1643	Q79757	Store norske leksikon; Lex (Den Store Danske)
Piano	invented c. 1700	Q5994	Store norske leksikon; Lex (Den Store Danske)
Lightning rod	invented 1752	Q7973	Store norske leksikon
Spinning jenny	invented 1764	Q49015	Store norske leksikon
World Wide Web	proposed 1989	Q466	Store norske leksikon; Lex (Den Store Danske)
Crossword puzzle	first published 1913	Q83207 (no value)	Store norske leksikon; Lex (Den Store Danske)
Christmas card	first made 1843	Q622508 (no value)	Store norske leksikon; Lex (Den Store Danske)
Parachute jump	first made 1797	Q482816 (no value)	Store norske leksikon; Lex (Den Store Danske)
Kaleidoscope	invented 1816	Q180049	Store norske leksikon; Lex (Den Store Danske)
Accordion	patented 1829	Q79838	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online
Esperanto	first published 1887	Q143	Store norske leksikon; Lex (Den Store Danske)
Ferris wheel	first built 1893	Q202570	Lex (Den Store Danske)
Microchip (integrated circuit)	invented 1958	Q80831	Store norske leksikon
Transistor	invented 1947	Q5339	Lex (Den Store Danske); Treccani Enciclopedia online
Laser	first built 1960	Q38867	Store norske leksikon; Lex (Den Store Danske)
Postage stamp (Penny Black)	first issued 1840	Q107701	Store norske leksikon
Postcard	first issued 1869	Q192425 (no value)	Store norske leksikon; Lex (Den Store Danske)
Air-filled bicycle tyre (Dunlop)	patented 1888	Q169545 (no value)	Store norske leksikon; Lex (Den Store Danske)
Pasteurisation	invented 1864	Q58148	Lex (Den Store Danske)
Colosseum	opened 80 CE	Q10285 (no value)	Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini); Store norske leksikon
Hagia Sophia (today’s building)	completed 537 CE	Q12506	Store norske leksikon; Hrvatska enciklopedija
St. Peter’s Basilica	construction began 1506	Q12512	Store norske leksikon; Lex (Den Store Danske)
Eiffel Tower	opened 1889	Q243	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Statue of Liberty	dedicated 1886	Q9202	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Brooklyn Bridge	opened 1883	Q125006	Lex (Den Store Danske)
Golden Gate Bridge	opened 1937	Q44440	Store norske leksikon; Lex (Den Store Danske)
Sydney Opera House	opened 1973	Q45178	Store norske leksikon
Burj Khalifa	opened 2010	Q12495	Store norske leksikon
Tower Bridge	completed 1894	Q83125	Store norske leksikon
Sagrada Família	construction began 1882	Q48435	Lex (Den Store Danske)
Neuschwanstein Castle	construction began 1869	Q4152	Store norske leksikon
White House	first lived in 1800	Q35525	Store norske leksikon; Lex (Den Store Danske)
CN Tower	completed 1976	Q134883	Store norske leksikon
Panama Canal	opened 1914	Q7350	Store norske leksikon; Lex (Den Store Danske)
Suez Canal	opened 1869	Q899	Store norske leksikon; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Channel Tunnel	opened 1994	Q10257	Store norske leksikon; Getlink (Channel Tunnel operator)
Hoover Dam	completed 1936	Q172822	Store norske leksikon
Parthenon	construction began 447 BCE	Q10288 (no value)	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
Trevi Fountain	completed 1762	Q185382	Store norske leksikon
Spanish Steps	completed 1725	Q848072	Store norske leksikon
Brandenburg Gate	completed 1791	Q82425	Store norske leksikon
Dome of the Rock	completed 691 CE	Q172077	Store norske leksikon
Hadrian’s Wall	construction began 122 CE	Q57357	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Atomium	opened 1958	Q180901	Lex (Den Store Danske)
Sydney Harbour Bridge	opened 1932	Q54495	Lex (Den Store Danske)
Ponte Vecchio (today’s bridge)	completed 1345	Q208633	Store norske leksikon
Leaning Tower of Pisa	construction began 1173	Q39054	Lex (Den Store Danske)
Notre-Dame de Paris	construction began 1163	Q2981	Store norske leksikon; Lex (Den Store Danske)
Stonehenge (first stage)	first built c. 3000 BCE	Q39671	Store norske leksikon; Lex (Den Store Danske)
Harvard University	founded 1636	Q13371	Store norske leksikon; Treccani Enciclopedia online; Hrvatska enciklopedija
University of Cambridge	founded 1209	Q35794	Hrvatska enciklopedija
Yale University	founded 1701	Q49112	Store norske leksikon; Lex (Den Store Danske)
Royal Society	founded 1660	Q123885	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
Académie française	founded 1635	Q161806	Store norske leksikon; Treccani Enciclopedia online
United Nations	founded 1945	Q1065	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Sapere.it encyclopedia (De Agostini)
Nobel Prize (first awarded)	first awarded 1901	Q7191	Store norske leksikon; Lex (Den Store Danske)
NASA	founded 1958	Q23548	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Saint Petersburg	founded 1703	Q656	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
Sydney	founded 1788	Q3130	Store norske leksikon; Sapere.it encyclopedia (De Agostini)
Brasília	inaugurated 1960	Q2844	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Canberra	construction began 1913	Q3114	Store norske leksikon; Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Chicago (as a city)	incorporated 1837	Q1297	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Boston	founded 1630	Q100	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
Quebec City	founded 1608	Q2145	Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
Jamestown, Virginia	founded 1607	Q323813	Store norske leksikon
Washington, D.C.	site chosen 1790	Q61	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Library of Congress	founded 1800	Q131454	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Metropolitan Museum of Art	founded 1870	Q160236	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Louvre (as a museum)	opened 1793	Q19675	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
British Museum	founded 1753	Q6373	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Smithsonian Institution	founded 1846	Q131626	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
Yellowstone National Park	founded 1872	Q351	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Bank of England	founded 1694	Q183231	Store norske leksikon; Lex (Den Store Danske)
Tour de France (first race)	first held 1903	Q33881	Store norske leksikon; Lex (Den Store Danske)
FA Cup (first season)	first held 1871	Q11151	Store norske leksikon; Lex (Den Store Danske)
Basketball	invented 1891	Q5372	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online
Volleyball	invented 1895	Q1734	Store norske leksikon; Lex (Den Store Danske)
Red Cross (international committee)	founded 1863	Q7178	Store norske leksikon; Lex (Den Store Danske)
Scouting	founded 1907	Q872181	Store norske leksikon; Lex (Den Store Danske); Treccani, Enciclopedia Italiana (1929–1937)
The Scream (Munch)	painted 1893	Q471379	Store norske leksikon
Guernica (Picasso)	painted 1937	Q175036	Store norske leksikon
The Night Watch (Rembrandt)	painted 1642	Q219831	Store norske leksikon; Lex (Den Store Danske)
Mona Lisa	begun c. 1503	Q12418	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
Don Quixote (part one)	first published 1605	Q480	Store norske leksikon
Romeo and Juliet	first published 1597	Q83186	Store norske leksikon; Lex (Den Store Danske)
Pride and Prejudice	first published 1813	Q170583	Store norske leksikon
Frankenstein	first published 1818	Q150827	Store norske leksikon; Lex (Den Store Danske)
Alice’s Adventures in Wonderland	first published 1865	Q92640	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Moby-Dick	first published 1851	Q174596	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Robinson Crusoe	first published 1719	Q483034	Lex (Den Store Danske)
Gulliver’s Travels	first published 1726	Q181488	Store norske leksikon
Jane Eyre	first published 1847	Q182961	Store norske leksikon
The Hobbit	first published 1937	Q74287	Store norske leksikon; Lex (Den Store Danske)
Nineteen Eighty-Four	first published 1949	Q208460	Store norske leksikon
The Little Prince	first published 1943	Q25338	Store norske leksikon
The Jungle Book	first published 1894	Q189509	Store norske leksikon; Lex (Den Store Danske)
The Adventures of Pinocchio	first published as a book 1883	Q8065468	Lex (Den Store Danske)
On the Origin of Species	first published 1859	Q20124	Store norske leksikon; Lex (Den Store Danske)
Grimms’ Fairy Tales (first volume)	first published 1812	Q163027	Lex (Den Store Danske)
The Nutcracker (ballet)	premiered 1892	Q193705	Store norske leksikon; Lex (Den Store Danske)
Swan Lake (ballet)	premiered 1877	Q199786	Store norske leksikon; Lex (Den Store Danske)
Boléro (Ravel)	premiered 1928	Q327331	Store norske leksikon
Rhapsody in Blue	premiered 1924	Q722599	Store norske leksikon
Metropolis (film)	released 1927	Q151599	Store norske leksikon
Casablanca (film)	released 1942	Q132689	Store norske leksikon
The Wizard of Oz (film)	released 1939	Q193695	Store norske leksikon
Les Misérables	first published 1862	Q180736	Store norske leksikon; Lex (Den Store Danske)
Micrographia (Hooke)	first published 1665	Q46830 (no value)	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online
The Three Musketeers	first published 1844	Q140527	Store norske leksikon; Lex (Den Store Danske)
Wright brothers’ first powered flight	happened 1903	Q688605	Store norske leksikon; Smithsonian National Air and Space Museum
First Moon landing (Apollo 11)	happened 1969	Q43653	Lex (Den Store Danske)
Uranus discovered	discovered 1781	Q324	Store norske leksikon; Lex (Den Store Danske); Treccani, Enciclopedia Italiana (1929–1937)
Neptune discovered	discovered 1846	Q332 (no value)	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini); NASA NSSDCA planetary fact sheet
Pluto discovered	discovered 1930	Q339	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
Magna Carta	sealed 1215	Q12519	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
Battle of Hastings	happened 1066	Q83224	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Sapere.it encyclopedia (De Agostini)
Rosetta Stone found	found 1799	Q48584	Store norske leksikon; Lex (Den Store Danske)
Terracotta Army found	found 1974	Q47672	Store norske leksikon
Electron discovered	discovered 1897	Q2225	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
US Declaration of Independence	signed 1776	Q127912	Store norske leksikon
X-rays discovered	discovered 1895	Q35149 (no value)	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
First ascent of Mount Everest	happened 1953	Q513 (no value)	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
First ascent of Mont Blanc	happened 1786	Q583 (no value)	Store norske leksikon; Lex (Den Store Danske); Sapere.it encyclopedia (De Agostini)
First ascent of the Matterhorn	happened 1865	Q1374 (no value)	Store norske leksikon; Lex (Den Store Danske); Hrvatska enciklopedija
First ascent of Kilimanjaro	happened 1889	Q7296 (no value)	Store norske leksikon; Treccani Enciclopedia online
Eruption of Vesuvius that buried Pompeii	happened 79 CE	Q524 (no value)	Store norske leksikon; Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Titanic sinks	happened 1912	Q25173 (no value)	Hrvatska enciklopedija; Lex (Den Store Danske)
Okapi described by science	described 1901	Q82037 (no value)	Animal Diversity Web, University of Michigan; Lex (Den Store Danske); Store norske leksikon
First human in space (Gagarin)	happened 1961	Q7327 (no value)	Store norske leksikon; Lex (Den Store Danske)
Tutankhamun’s tomb found	found 1922	Q12154 (no value)	Store norske leksikon; Lex (Den Store Danske)
DNA double helix described	described 1953	Q7430 (no value)	Store norske leksikon; Lex (Den Store Danske)
First smallpox vaccination (Jenner)	happened 1796	Q40852 (no value)	Lex (Den Store Danske); Treccani Enciclopedia online
South Pole first reached	happened 1911	Q926 (no value)	Store norske leksikon; Lex (Den Store Danske)
Penicillin discovered	discovered 1928	Q12190	Lex (Den Store Danske); Hrvatska enciklopedija; Sapere.it encyclopedia (De Agostini)
Radium discovered (Curies)	discovered 1898	Q7186 (no value)	Store norske leksikon; Lex (Den Store Danske)
First human heart transplant	happened 1967	Q188803 (no value)	Store norske leksikon; Lex (Den Store Danske)
First solo flight across the Atlantic	happened 1927	Q1618 (no value)	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online
First flight across the English Channel	happened 1909	Q5396 (no value)	Store norske leksikon; Lex (Den Store Danske); Treccani Enciclopedia online; Hrvatska enciklopedija
First long-distance telegram (Morse)	happened 1844	Q75698 (no value)	Store norske leksikon; Lex (Den Store Danske)

Drawings, text and font

All 108 silhouettes, the group symbols and the brand mark are original SVG drawn in code for Idistic, with no tracing of photographs and no third-party artwork; each has a provenance record with its hash. Notes and explanations are written for Size Duel; no encyclopedia text is reused beyond the short quotations. Brand and product names (for example Airbus A380) are used only to name the thing measured. Font: Bricolage Grotesque, © The Bricolage Grotesque Project Authors, SIL Open Font License 1.1, served from this site.

Corrections are welcome at support@twindle.nl; a changed item gets a new revision, and published daily rounds keep their duels.