Planet Earth

• 1Age of EarthApproximately 4.54 billion years
• 2Age of the UniverseApproximately 13.8 billion years
• 3Circumference at equator40,075 km
• 4Circumference pole to pole40,008 km
• 5Diameter at equator12,756 km
• 6Mass of Earth5.97 x 10^24 kg
• 7Total surface area510 million km2
• 8Land surface149 million km2 (29% of total)
• 9Ocean surface361 million km2 (71% of total)
• 10Number of continents7
• 11Number of oceans5 – Pacific, Atlantic, Indian, Arctic, Southern
• 12Largest continentAsia – 44.6 million km2
• 13Smallest continentAustralia/Oceania – 7.7 million km2
• 14Largest oceanPacific – 165 million km2
• 15Smallest oceanArctic – 14 million km2
• 16Average ocean depth3,688 m
• 17Deepest ocean pointChallenger Deep, Mariana Trench – 10,935 m
• 18Total volume of water on Earth1.386 billion km3
• 19Freshwater as % of all water2.5%
• 20Accessible freshwaterLess than 1% of all Earth’s water
• 21Earth’s rotation period (sidereal day)23 hours 56 minutes
• 22Earth’s orbit period365.25 days
• 23Distance from Sun (average)149.6 million km (1 AU)
• 24Atmospheric composition78% nitrogen, 21% oxygen, ~1% argon and other
• 25CO2 in atmosphere (2025)~424 parts per million
• 26Number of UN-recognised countries195
• 27World population (2025)~8.2 billion
• 28Active volcanoes on Earth~1,500
• 29Earthquakes per year (estimated)~500,000 – most imperceptible
• 30Total length of world’s coastlines~620,000 km
• 31Country with longest coastlineCanada – 202,080 km
• 32Tectonic plates~15 major plates, dozens of minor ones
• 33Hottest recorded temperature56.7C – Death Valley, California, 1913
• 34Coldest recorded temperature-89.2C – Vostok Station, Antarctica, 1983
• 35Wettest place (average annual rainfall)Mawsynram, India – 11,871 mm per year
• 36Driest inhabited placeAtacama Desert – some areas recorded no rainfall for centuries
• 37Largest country by areaRussia – 17.1 million km2
• 38Smallest country by areaVatican City – 0.44 km2
• 39Most forested country (% of land)Suriname – ~93% forest cover
• 40Country with most time zonesFrance (including overseas territories) – 12

Rivers and Lakes

• 41Longest riverNile – 6,650 km (Uganda, Sudan, Egypt)
• 422nd longest riverAmazon – 6,400 km (Peru, Brazil)
• 433rd longest riverYangtze – 6,300 km (China)
• 444th longest riverMississippi-Missouri – 6,275 km (USA)
• 455th longest riverYenisei-Angara – 5,539 km (Russia)
• 466th longest riverYellow River (Huang He) – 5,464 km (China)
• 477th longest riverOb-Irtysh – 5,410 km (Russia, Kazakhstan)
• 488th longest riverCongo – 4,700 km (DR Congo, Congo)
• 499th longest riverAmur – 4,444 km (China, Russia)
• 5010th longest riverLena – 4,400 km (Russia)
• 51Longest river in EuropeVolga – 3,692 km (Russia)
• 52Longest river in South AmericaAmazon (also greatest by discharge)
• 53River with greatest water dischargeAmazon – carries ~20% of all fresh water discharged globally
• 54Longest river in UKRiver Severn – 354 km
• 55Longest river in USAMissouri (2,341 km) – longer than Mississippi though both are usually combined
• 56Longest river in AfricaNile
• 57Deepest riverCongo River – depths exceeding 220 m
• 58Largest lake by areaCaspian Sea – 371,000 km2 (technically a lake)
• 59Largest freshwater lake by areaLake Superior – 82,100 km2 (USA/Canada)
• 602nd largest freshwater lakeLake Victoria – 68,870 km2 (Uganda, Kenya, Tanzania)
• 613rd largest freshwater lakeLake Huron – 59,600 km2 (USA/Canada)
• 624th largest freshwater lakeLake Michigan – 57,800 km2 (USA)
• 635th largest freshwater lakeLake Tanganyika – 32,600 km2 (Tanzania, DR Congo, Burundi, Zambia)
• 64Deepest lake in worldLake Baikal, Russia – 1,642 m deep
• 65Lake Baikal water volumeContains ~20% of world’s unfrozen surface fresh water
• 66Highest navigable lakeLake Titicaca, Bolivia/Peru – 3,812 m above sea level
• 67Lowest lakeDead Sea, Jordan/Israel – surface at -430 m
• 68Saltiest lakeDon Juan Pond, Antarctica – ~40% salinity (the Dead Sea is ~34%)
• 69Largest lake in AfricaLake Victoria
• 70Largest lake in South AmericaLake Titicaca
• 71Largest lake in AustraliaLake Eyre (Kati Thanda) – a salt lake, usually dry
• 72Highest waterfallAngel Falls, Venezuela – 979 m total drop
• 73Highest waterfall, widestKhone Falls (Mekong), Laos – 10,783 m wide
• 74Most powerful waterfall by volumeInga Falls, DR Congo
• 75Most visited waterfallNiagara Falls, USA/Canada
• 76Great LakesSuperior, Michigan, Huron, Erie, Ontario – largest group of freshwater lakes on Earth
• 77Longest canalGrand Canal, China – 1,776 km, built from 5th century BCE
• 78Busiest ship canalSuez Canal – ~19,000 vessels per year
• 79Rhine length1,230 km (Switzerland to Netherlands)
• 80Danube length2,860 km – flows through 10 countries (most of any river)
• 81Thames length346 km
• 82Nile sourceLake Victoria (White Nile tributary)
• 83Amazon sourceAndes mountains, Peru (~5,170 m elevation)
• 84Lake ChadOnce one of Africa’s largest lakes – has shrunk by ~90% since 1960
• 85Aral SeaWas 4th largest lake in world; now ~10% of original size due to Soviet irrigation diversion
• 86Murray-Darling river system3,750 km – Australia’s longest river system
• 87Mekong River4,350 km – flows through China, Myanmar, Laos, Thailand, Cambodia, Vietnam
• 88Ganges River2,525 km – considered sacred in Hinduism; supports ~400 million people
• 89Jordan River length251 km – sacred to Christians, Jews, Muslims
• 90World’s rivers total lengthEstimated ~600,000 km of rivers flow across the planet

Mountains, Deserts, and Geographic Extremes

• 91Highest mountainEverest – 8,849 m (Nepal/China)
• 922nd highest mountainK2 – 8,611 m (Pakistan/China)
• 933rd highest mountainKangchenjunga – 8,586 m (Nepal/India)
• 944th highest mountainLhotse – 8,516 m (Nepal/China)
• 955th highest mountainMakalu – 8,485 m (Nepal/China)
• 966th highest mountainCho Oyu – 8,188 m (Nepal/China)
• 977th highest mountainDhaulagiri – 8,167 m (Nepal)
• 988th highest mountainManaslu – 8,163 m (Nepal)
• 999th highest mountainNanga Parbat – 8,126 m (Pakistan)
• 10010th highest mountainAnnapurna I – 8,091 m (Nepal)
• 1018,000 m+ peaks14 mountains exceed 8,000 m – all in the Himalayas or Karakoram
• 102Highest mountain in AfricaKilimanjaro, Tanzania – 5,895 m
• 103Highest mountain in EuropeMont Blanc, France/Italy – 4,808 m (or Elbrus, Russia – 5,642 m if Caucasus counted as Europe)
• 104Highest mountain in North AmericaDenali (McKinley), Alaska – 6,190 m
• 105Highest mountain in South AmericaAconcagua, Argentina – 6,961 m
• 106Highest mountain in AustralasiaPuncak Jaya, Indonesia – 4,884 m
• 107Highest mountain in AntarcticaVinson Massif – 4,892 m
• 108Highest mountain in British IslesBen Nevis, Scotland – 1,345 m
• 109Tallest mountain from ocean floorMauna Kea, Hawaii – ~10,100 m from base (4,207 m above sea level)
• 110Longest mountain range on landAndes, South America – ~7,000 km
• 111Longest mountain range on EarthMid-Ocean Ridge – ~65,000 km (mostly underwater)
• 112First Everest summitEdmund Hillary and Tenzing Norgay – 29 May 1953
• 113Largest desert overallAntarctic Desert – 14.2 million km2
• 1142nd largest desertArctic Desert – 13.9 million km2
• 115Largest hot desertSahara – 9.2 million km2 (North Africa)
• 1162nd largest hot desertArabian Desert – 2.3 million km2
• 1173rd largest hot desertGobi Desert – 1.3 million km2 (China/Mongolia)
• 118Largest desert in AustraliaGreat Victoria Desert – 647,000 km2
• 119Largest islandGreenland – 2,130,800 km2
• 1202nd largest islandNew Guinea – 785,753 km2
• 1213rd largest islandBorneo – 748,168 km2
• 122Largest archipelagoIndonesia – over 17,000 islands
• 123Largest coral reefGreat Barrier Reef, Australia – 2,300 km long
• 124Largest rainforestAmazon – ~5.5 million km2
• 125Largest canyonGrand Canyon, USA – 446 km long, 1,600 m deep
• 126Deepest canyonYarlung Tsangpo Grand Canyon, Tibet – ~5,382 m deep
• 127Largest salt flatSalar de Uyuni, Bolivia – 10,582 km2
• 128Tallest building (2025)Burj Khalifa, Dubai – 828 m (163 floors)
• 129Longest bridgeDanyang-Kunshan Grand Bridge, China – 164.8 km
• 130Longest rail tunnelGotthard Base Tunnel, Switzerland – 57.1 km

Countries and Capital Cities: A to L

• 131AfghanistanKabul
• 132AlbaniaTirana
• 133AlgeriaAlgiers
• 134AngolaLuanda
• 135ArgentinaBuenos Aires
• 136ArmeniaYerevan (independent 1991 – was Soviet)
• 137AustraliaCanberra (not Sydney)
• 138AustriaVienna
• 139AzerbaijanBaku (independent 1991 – was Soviet)
• 140BangladeshDhaka
• 141BelarusMinsk (independent 1991 – was Soviet)
• 142BelgiumBrussels
• 143BoliviaSucre (constitutional); La Paz (seat of government)
• 144Bosnia and HerzegovinaSarajevo (independent 1992 – was Yugoslavia)
• 145BotswanaGaborone
• 146BrazilBrasilia (not Rio de Janeiro or Sao Paulo)
• 147BulgariaSofia
• 148CambodiaPhnom Penh
• 149CameroonYaounde
• 150CanadaOttawa (not Toronto or Montreal)
• 151ChileSantiago
• 152ChinaBeijing
• 153ColombiaBogota
• 154CroatiaZagreb (independent 1991 – was Yugoslavia)
• 155CubaHavana
• 156CyprusNicosia
• 157Czech RepublicPrague (separated from Slovakia 1993)
• 158DenmarkCopenhagen
• 159DR CongoKinshasa (was Zaire 1971-1997)
• 160EcuadorQuito
• 161EgyptCairo
• 162El SalvadorSan Salvador
• 163EritreaAsmara (independent 1993 from Ethiopia)
• 164EstoniaTallinn (independent 1991 – was Soviet)
• 165EthiopiaAddis Ababa
• 166FinlandHelsinki
• 167FranceParis
• 168GeorgiaTbilisi (independent 1991 – was Soviet)
• 169GermanyBerlin (capital was Bonn 1949-1999 for West Germany)
• 170GhanaAccra
• 171GreeceAthens
• 172GuatemalaGuatemala City
• 173HungaryBudapest
• 174IcelandReykjavik
• 175IndiaNew Delhi
• 176IndonesiaJakarta (new capital Nusantara under construction)
• 177IranTehran
• 178IraqBaghdad
• 179IrelandDublin
• 180IsraelJerusalem (claimed); Tel Aviv area internationally recognised by most countries
• 181ItalyRome
• 182Ivory Coast (Cote d’Ivoire)Yamoussoukro (official); Abidjan (economic capital)
• 183JapanTokyo
• 184JordanAmman
• 185KazakhstanAstana (was Almaty until 1997)
• 186KenyaNairobi
• 187KosovoPristina (declared independence 2008)
• 188KuwaitKuwait City
• 189KyrgyzstanBishkek (independent 1991 – was Soviet)
• 190LaosVientiane
• 191LatviaRiga (independent 1991 – was Soviet)
• 192LebanonBeirut
• 193LibyaTripoli
• 194LithuaniaVilnius (independent 1991 – was Soviet)
• 195LuxembourgLuxembourg City

Countries and Capital Cities: M to Z

• 196MalaysiaKuala Lumpur (administrative capital: Putrajaya)
• 197MaliBamako
• 198MexicoMexico City
• 199MoldovaChisinau (independent 1991 – was Soviet)
• 200MongoliaUlaanbaatar
• 201MoroccoRabat (not Casablanca)
• 202MozambiqueMaputo
• 203MyanmarNaypyidaw (was Rangoon/Yangon until 2006)
• 204NepalKathmandu
• 205NetherlandsAmsterdam (seat of government: The Hague)
• 206New ZealandWellington (not Auckland)
• 207NicaraguaManagua
• 208NigeriaAbuja (was Lagos until 1991)
• 209North KoreaPyongyang
• 210North MacedoniaSkopje (independent 1991 – was Yugoslavia)
• 211NorwayOslo
• 212OmanMuscat
• 213PakistanIslamabad (not Karachi or Lahore)
• 214PanamaPanama City
• 215Papua New GuineaPort Moresby
• 216PeruLima
• 217PhilippinesManila
• 218PolandWarsaw
• 219PortugalLisbon
• 220QatarDoha
• 221RomaniaBucharest
• 222RussiaMoscow
• 223Saudi ArabiaRiyadh
• 224SenegalDakar
• 225SerbiaBelgrade (independent 2006)
• 226SingaporeSingapore City (city-state)
• 227SlovakiaBratislava (separated from Czech Republic 1993)
• 228SloveniaLjubljana (independent 1991 – was Yugoslavia)
• 229SomaliaMogadishu
• 230South AfricaPretoria (administrative) / Cape Town (legislative) / Bloemfontein (judicial)
• 231South KoreaSeoul
• 232South SudanJuba (independent 2011 – world’s newest country)
• 233SpainMadrid
• 234Sri LankaSri Jayawardenepura Kotte (official) / Colombo (commercial)
• 235SudanKhartoum
• 236SwedenStockholm
• 237SwitzerlandBern (not Zurich or Geneva)
• 238SyriaDamascus
• 239TaiwanTaipei
• 240TajikistanDushanbe (independent 1991 – was Soviet)
• 241TanzaniaDodoma (official) / Dar es Salaam (largest city)
• 242ThailandBangkok (official name: Krung Thep Maha Nakhon – longest capital city name)
• 243Timor-LesteDili (independent 2002 from Indonesia)
• 244TunisiaTunis
• 245TurkeyAnkara (not Istanbul)
• 246TurkmenistanAshgabat (independent 1991 – was Soviet)
• 247UgandaKampala
• 248UkraineKyiv (independent 1991 – was Soviet)
• 249United Arab EmiratesAbu Dhabi (not Dubai)
• 250United KingdomLondon
• 251United StatesWashington D.C. (not New York)
• 252UruguayMontevideo
• 253UzbekistanTashkent (independent 1991 – was Soviet)
• 254VenezuelaCaracas
• 255VietnamHanoi (not Ho Chi Minh City)
• 256YemenSana’a
• 257ZambiaLusaka
• 258ZimbabweHarare (was Salisbury until 1982)
• 259Notable capital: CanberraChosen as Australian capital in 1908 as a compromise between Sydney and Melbourne rivals
• 260Notable capital: BrasiliaBuilt from scratch in the interior of Brazil, inaugurated 1960
• 261Notable capital: NaypyidawMyanmar moved capital from Yangon in 2006 – built as a new city, famously empty
• 262Notable capital: AstanaKazakhstan moved capital from Almaty 1997; renamed Astana (meaning “capital”) 2022
• 263Notable capital: AbujaNigeria moved capital from Lagos 1991; Lagos remains by far the largest city
• 264Notable capital: BerlinGermany’s capital moved from Bonn back to Berlin in 1999 after reunification
• 265Most landlocked capitalUlaanbaatar, Mongolia – furthest from any sea of any capital city
• 266Highest capital cityLa Paz, Bolivia – 3,640 m above sea level (seat of government); Quito, Ecuador is 2,850 m
• 267Most populous capitalTokyo, Japan – ~14 million in the city proper
• 268Smallest capital by populationVatican City / Ngerulmud, Palau (~250 people)
• 269Countries with no capitalNauru has no official capital; government based in Yaren district
• 270Countries with two capitalsBenin (Porto-Novo/Cotonou), Bolivia (Sucre/La Paz), South Africa (three)
• 271New countries since 1975~46 new UN member states since 1975, mostly from Soviet dissolution and Yugoslav breakup
• 272Newest UN member stateSouth Sudan (2011)
• 273Country that no longer exists: USSRDissolved December 25, 1991 – became 15 independent nations
• 274Country that no longer exists: YugoslaviaBroke apart 1991-2008 into 7 nations
• 275Country that no longer exists: CzechoslovakiaPeacefully dissolved January 1, 1993 – Czech Republic and Slovakia
• 276Country renamed: ZimbabweWas Rhodesia until 1980; Salisbury became Harare
• 277Country renamed: EswatiniWas Swaziland until 2018
• 278Country renamed: TürkiyeTurkey officially adopted Türkiye internationally in 2022
• 279Country renamed: North MacedoniaWas FYROM (Former Yugoslav Republic of Macedonia) until 2019
• 280Country renamed: Cabo VerdeWas Cape Verde until 2013
• 281Most visited country (2023)France – ~100 million international tourists per year
• 282Country with most World Heritage SitesItaly – 59 UNESCO World Heritage Sites (2024)
• 283Country in two continentsRussia (Europe/Asia), Turkey (Europe/Asia), Egypt (Africa/Asia)
• 284Countries with no riversSaudi Arabia, Yemen, Oman, UAE, Qatar, Kuwait, Bahrain, Malta
• 285Country with most neighboursChina and Russia – both border 14 countries
• 286Countries that share no borderUK and France are separated by the English Channel – connected by the Channel Tunnel
• 287Country entirely surrounded by one countryLesotho (surrounded by South Africa) and Vatican City/San Marino (surrounded by Italy)
• 288Oldest continuous countrySan Marino claims to be the world’s oldest republic, founded 301 CE
• 289Most ethnically diverse countryPapua New Guinea – over 800 distinct ethnic groups
• 290Least densely populated countryMongolia – ~2 people per km2
• 291Most densely populated countryMonaco – ~26,000 people per km2
• 292India overtook ChinaIndia became the world’s most populous country in 2023
• 293Only country named after a womanSaint Lucia (patron saint)
• 294Countries with the word “The” officiallyThe Gambia and The Bahamas
• 295ExclaveKaliningrad is Russian territory on the Baltic Sea, separated from mainland Russia by Lithuania and Belarus
• 296French overseas departmentsFrance’s GDP includes overseas departments – Martinique, Guadeloupe, French Guiana, Reunion, Mayotte
• 297Country with most islandsSweden (~220,000 islands)
• 298Most isolated capital citySuva, Fiji / Nuku’alofa, Tonga
• 299Longest country nameThe United Kingdom of Great Britain and Northern Ireland
• 300Shortest country nameChad, Cuba, Fiji, Iran, Iraq, Laos, Mali, Niue, Oman, Peru, Togo

Populations of the World

• 301World population (2025)~8.2 billion
• 3021. India~1.45 billion (overtook China as most populous in 2023)
• 3032. China~1.41 billion (population now declining)
• 3043. United States~341 million
• 3054. Indonesia~280 million
• 3065. Pakistan~247 million
• 3076. Brazil~216 million
• 3087. Nigeria~230 million
• 3098. Bangladesh~173 million
• 3109. Russia~144 million
• 31110. Ethiopia~132 million
• 31211. Mexico~130 million
• 31312. Japan~123 million (declining population)
• 31413. Philippines~118 million
• 31514. DR Congo~105 million
• 31615. Egypt~105 million
• 317UK population~68 million
• 318Germany population~84 million
• 319France population~68 million
• 320Italy population~59 million (declining)
• 321Population of Asia~4.7 billion (57% of world total)
• 322Population of Africa~1.5 billion (18%) – fastest growing continent
• 323Population of Europe~748 million (9%)
• 324Population of North America~608 million (7%)
• 325Population of South America~440 million (5%)
• 326Population of Oceania~46 million (0.5%)
• 327Largest city by urban agglomerationTokyo – ~37 million
• 3282nd largest cityDelhi – ~33 million
• 3293rd largest cityShanghai – ~29 million
• 3304th largest cityDhaka – ~23 million
• 3315th largest citySao Paulo – ~22 million
• 332Largest city in AfricaLagos, Nigeria – ~15 million
• 333Largest city in EuropeMoscow – ~13 million (city proper)
• 334Largest city in South AmericaSao Paulo
• 335Largest city in North AmericaMexico City – ~22 million
• 336Largest city in AustralasiaSydney – ~5.3 million
• 337% of world living in cities (2025)~57% – first time in history more people live in cities than rural areas (crossed 2007)
• 338Global median age (2025)~31 years
• 339Oldest median age countryMonaco and Japan (~49 years)
• 340Youngest median age countryNiger (~15 years)
• 341Global birth rate (2025)~18 births per 1,000 people per year
• 342Global death rate~8 deaths per 1,000 people per year
• 343Global fertility rate (2025)~2.3 children per woman (below 2.1 replacement rate in many developed nations)
• 344Highest fertility rate countryNiger – ~6.8 children per woman
• 345Lowest fertility rate countrySouth Korea – ~0.72 children per woman
• 346Global life expectancy~73 years
• 347Highest life expectancy countryJapan / Hong Kong – ~85 years
• 348Lowest life expectancy countryChad / Central African Republic – ~55 years
• 349UK life expectancy~81 years (men 79, women 83)
• 350World population projection 2100~10-11 billion (UN medium estimate)

The Solar System and Space

• 351The Sun – diameter1,391,000 km (109 times Earth’s diameter)
• 352The Sun – massAccounts for 99.86% of the mass of the entire solar system
• 353The Sun – age~4.6 billion years (mid-life)
• 354The Sun – surface temperature~5,500C
• 355Light from Sun to Earth8 minutes 20 seconds
• 356Mercury – distance from Sun57.9 million km
• 357Mercury – year length88 Earth days
• 358Mercury – moons0
• 359Venus – distance from Sun108.2 million km
• 360Venus – surface temperature~465C average – hottest planet despite not being closest to Sun
• 361Venus – day length243 Earth days – longer than its year (225 days)
• 362Mars – distance from Sun227.9 million km
• 363Mars – day length24 hours 37 minutes
• 364Mars – moons2 (Phobos and Deimos)
• 365Mars – highest pointOlympus Mons – 21,900 m (largest volcano in solar system)
• 366Jupiter – diameter142,984 km (11 times Earth’s diameter)
• 367Jupiter – mass318 times Earth’s mass
• 368Jupiter – moons95 confirmed (2025)
• 369Jupiter – Great Red SpotA storm larger than Earth, has persisted for at least 350 years
• 370Saturn – diameter120,536 km
• 371Saturn – densityLess than water – would float if placed in a large enough ocean
• 372Saturn – moons146 confirmed – most of any planet (2025)
• 373Saturn – largest moonTitan – larger than Mercury; has thick atmosphere and liquid methane lakes
• 374Uranus – orbital tilt98 degrees – essentially orbits on its side
• 375Uranus – moons28 confirmed
• 376Neptune – year length165 Earth years (completed first orbit since discovery in 2011)
• 377Neptune – largest moonTriton – orbits backwards; thought to be a captured Kuiper Belt object
• 378Pluto reclassifiedDemoted from planet to dwarf planet in 2006 by the IAU
• 379Asteroid beltBetween Mars and Jupiter – billions of asteroids but total mass less than Earth’s Moon
• 380The Moon – distance from Earth384,400 km (average)
• 381The Moon – diameter3,474 km
• 382The Moon – orbital period27.3 days
• 383The Moon – tidal lockingAlways shows the same face to Earth
• 384First moon landingApollo 11, July 20, 1969 – Neil Armstrong and Buzz Aldrin
• 385Last moon landingApollo 17, December 11, 1972
• 386Nearest star to the SunProxima Centauri – 4.24 light years away
• 387Speed of light299,792,458 metres per second (~300,000 km/s)
• 388Milky Way diameter~100,000 light years
• 389Stars in the Milky Way~200-400 billion estimated
• 390Galaxies in observable universe~2 trillion estimated
• 391First human in spaceYuri Gagarin, USSR, April 12, 1961
• 392First spacewalkAlexei Leonov, USSR, March 18, 1965
• 393First woman in spaceValentina Tereshkova, USSR, June 16, 1963
• 394ISS altitude~408 km above Earth
• 395ISS – continuously inhabited sinceNovember 2, 2000
• 396Farthest human-made objectVoyager 1 – launched 1977, now ~24 billion km from Earth
• 397Hubble Space TelescopeLaunched 1990; has made over 1.5 million observations
• 398James Webb Space TelescopeLaunched December 25, 2021; observes universe in infrared
• 399First black hole photographed2019, Event Horizon Telescope – M87* galaxy, 55 million light years away
• 400First exoplanet confirmed51 Pegasi b, 1995 – over 5,600 exoplanets confirmed as of 2025

Science

• 401Speed of sound in air (20C)343 m/s (1,235 km/h)
• 402Absolute zero-273.15 Celsius (0 Kelvin)
• 403Boiling point of water at sea level100C (212F)
• 404Freezing point of water0C (32F)
• 405Elements in the periodic table118 confirmed (as of 2025)
• 406Lightest elementHydrogen (atomic number 1)
• 407Heaviest naturally occurring elementUranium (atomic number 92)
• 408Most abundant element in universeHydrogen (~75% by mass)
• 409Most abundant element in Earth’s crustOxygen (46% by weight)
• 410Most abundant metal in Earth’s crustAluminium
• 411Hardest natural substanceDiamond (carbon in cubic crystal structure)
• 412Softest natural substanceTalc (1 on Mohs scale)
• 413Newton’s First LawAn object at rest stays at rest unless acted on by a force
• 414Newton’s Second LawForce = mass x acceleration (F=ma)
• 415Newton’s Third LawEvery action has an equal and opposite reaction
• 416E=mc2Einstein’s mass-energy equivalence, 1905 – energy equals mass times speed of light squared
• 417Gravitational acceleration on Earth9.81 m/s2
• 418pH scale0 (most acidic) to 14 (most alkaline); 7 is neutral (pure water)
• 419Avogadro’s number6.022 x 10^23 – number of particles per mole
• 420Pi3.14159… (ratio of circle’s circumference to its diameter)
• 421Pythagoras theoremIn a right-angled triangle: a2 + b2 = c2
• 422DNA structure announced1953 – Watson, Crick (and Franklin’s X-ray data)
• 423Human genome sequenced2003 – Human Genome Project completed
• 424CRISPR gene editingDiscovered 2012 – Doudna and Charpentier (2020 Nobel Prize)
• 425Chromosomes in human cells46 (23 pairs)
• 426Cells in the human body~37 trillion
• 427Theory of evolutionCharles Darwin, On the Origin of Species, 1859
• 428Plate tectonics theoryFormally accepted in the 1960s
• 429Big Bang theoryUniverse originated ~13.8 billion years ago from an extremely hot, dense state
• 430Standard Model of particle physicsDescribes 17 fundamental particles; Higgs boson confirmed 2012
• 431Gravitational waves detected2015, LIGO – confirmed Einstein’s 1916 prediction
• 432Nuclear fusion ignition2022, NIF California – first time more energy produced than energy put in
• 433Half-life of Carbon-145,730 years – used in radiocarbon dating
• 434Electromagnetic spectrum (low to high frequency)Radio, microwave, infrared, visible light, ultraviolet, X-ray, gamma ray
• 435Visible light wavelength range~380 nm (violet) to ~740 nm (red)
• 436States of matterSolid, liquid, gas, plasma (and lesser-known: Bose-Einstein condensate)
• 437Periodic table groupsAlkali metals, alkaline earth metals, transition metals, metalloids, nonmetals, halogens, noble gases
• 438Noble gasesHelium, neon, argon, krypton, xenon, radon – largely non-reactive
• 439Human body temperature – fever threshold38C or above
• 440Richter scaleEach whole number increase = 10x greater ground motion; 9.0+ causes devastation
• 441Largest earthquake recorded9.5 magnitude – Valdivia, Chile, 1960
• 442Decibel scale0 dB (threshold of hearing) to 130+ dB (pain); every 10 dB = 10x intensity
• 443First law of thermodynamicsEnergy cannot be created or destroyed, only transformed
• 444Second law of thermodynamicsEntropy (disorder) in a closed system always increases over time
• 445Theory of relativity – special1905 Einstein – space and time are relative; speed of light is constant
• 446Theory of relativity – general1915 Einstein – gravity is the curvature of space-time by mass
• 447Quantum mechanicsPhysics at subatomic scale – particles exist in superposition until measured
• 448First antibiotic discoveredPenicillin – Alexander Fleming, 1928
• 449Photosynthesis equation6CO2 + 6H2O + light energy = C6H12O6 + 6O2
• 450Periodic table – invented byDmitri Mendeleev, 1869

The Human Body

• 451Bones in adult human body206
• 452Bones at birth~300 (many fuse as we grow)
• 453Muscles in the human body~600
• 454Largest organSkin (~1.5-2 m2)
• 455Largest internal organLiver (~1.5 kg)
• 456Smallest boneStirrup (stapes) in the ear – ~3 mm long
• 457Longest boneFemur (thigh bone) – typically ~48 cm in adults
• 458Strongest muscle relative to sizeMasseter (jaw muscle)
• 459Blood volume in adult~5 litres
• 460Heart beats per day~100,000
• 461Heart beats per lifetime (80 years)~3 billion
• 462Breaths per day at rest~20,000
• 463Neurons in the brain~86 billion
• 464Brain weight~1.4 kg (about 2% of body weight)
• 465Length of DNA in each cell (uncoiled)~2 metres
• 466Length of small intestine~6-7 metres
• 467Length of large intestine~1.5 metres
• 468Normal body temperature37C (98.6F)
• 469Normal resting heart rate60-100 beats per minute
• 470Normal blood pressure~120/80 mmHg
• 471Blood type groups (ABO)A, B, AB, O – each positive or negative = 8 types
• 472Most common blood type globallyO positive (~38% of population)
• 473Rarest blood typeAB negative (~1% of population)
• 474Universal blood donorO negative
• 475Fastest nerve impulseUp to 120 m/s (motor neurons)
• 476Taste buds on tongue~10,000
• 477Hairs on human head (average)~100,000
• 478Hair growth rate~15 cm per year
• 479Fingernail growth rate~3.5 mm per month
• 480Eye resolutionThe human eye can distinguish ~10 million colours
• 481Smell receptors~400 distinct smell receptors – can detect ~1 trillion different odours
• 482Human genome size~3 billion base pairs; ~20,000-25,000 protein-coding genes
• 483DNA shared with chimpanzees~98.7%
• 484DNA shared between all humans~99.9% – all human diversity comes from 0.1% variation
• 485Human sleep need~7-9 hours for adults
• 486Longevity recordJeanne Calment, France – 122 years 164 days (1875-1997)
• 487Caloric requirement (adult average)~2,000-2,500 calories per day
• 488Water content of human body~60% (higher in infants)
• 489Organs that regrowThe liver can regenerate to full size after losing up to 75% of its mass
• 490AppendixLong thought vestigial – now thought to play a role in gut bacteria replenishment
• 491Microbiome~37 trillion microbial cells in/on the human body – roughly equal to human cells
• 492Red blood cells~25 trillion in the human body; live ~120 days; no nucleus
• 493White blood cells~37 billion; part of immune system; can live days to years
• 494Pain pathwayPain signals travel from injury to brain in ~0.001 seconds
• 495Sense not located in brainThe enteric nervous system (gut) has ~500 million neurons – the “second brain”
• 496Tallest person ever recordedRobert Wadlow (USA) – 2.72 m
• 497Human body’s most complex organThe brain – still not fully understood
• 498Organ you can live withoutSpleen, one kidney, gallbladder, appendix, part of the liver, part of the intestine
• 499Lung capacity (adult male)~6 litres total; normal breathing uses ~0.5 litres
• 500Heartbeats per minute – elite athlete resting~40 bpm (Miguel Indurain reportedly ~28 bpm)

The Animal Kingdom

• 501Largest animal everBlue whale – up to 33 m long, up to 180 tonnes
• 502Largest land animalAfrican elephant – up to 7 tonnes
• 503Tallest land animalGiraffe – up to 5.8 m
• 504Fastest land animalCheetah – up to 120 km/h over short distances
• 505Fastest bird (level flight)Common swift – up to 170 km/h
• 506Fastest animal (diving)Peregrine falcon – up to 389 km/h in a stoop
• 507Fastest fishBlack marlin – up to 130 km/h
• 508Slowest mammalThree-toed sloth – ~0.27 km/h
• 509Largest birdOstrich – up to 2.8 m tall, up to 160 kg; also lays largest egg
• 510Smallest birdBee hummingbird (Cuba) – 5-6 cm, ~1.6 g
• 511Largest wingspanWandering albatross – up to 3.7 m
• 512Largest reptileSaltwater crocodile – up to 6 m, up to 1,000 kg
• 513Longest snakeReticulated python – up to 8 m
• 514Most venomous snakeInland taipan (Australia) – one bite has enough venom to kill 100 humans
• 515Largest fishWhale shark – up to 18 m (filter feeder, harmless to humans)
• 516Largest invertebrateColossal squid – up to 14 m
• 517Smallest mammal by weightEtruscan shrew – ~1.8 g
• 518Smallest reptileBrookesia nana chameleon (Madagascar) – ~14 mm
• 519Largest primateEastern gorilla – males up to 200 kg
• 520Most intelligent non-human animalChimpanzee, dolphin, and crow frequently cited; octopus also remarkable
• 521Animal responsible for most human deaths annuallyMosquito (~750,000 via malaria, dengue etc)
• 522Most deadly snake to humansSaw-scaled viper (more bites/deaths than any other)
• 523Most dangerous marine animalBox jellyfish (venom)
• 524Loudest animalSperm whale – clicks up to 230 dB
• 525Longest lifespan recorded (animal)Ocean quahog clam – one specimen aged 507 years
• 526Longest lifespan (mammal)Bowhead whale – up to ~200 years
• 527Longest migrationArctic tern – travels ~70,000 km per year between poles
• 528Deepest diving mammalCuvier’s beaked whale – over 3,000 m depth; can hold breath ~3.5 hours
• 529Strongest animal relative to weightDung beetle – can pull 1,141 times its own body weight
• 530Estimated species on Earth~8.7 million (only ~1.5 million have been catalogued)
• 531Known mammal species~6,400
• 532Known bird species~10,000
• 533Known reptile species~11,500
• 534Known amphibian species~8,400
• 535Known fish species~35,000
• 536Known insect species~1 million described; estimated 5-10 million exist
• 537Most species-rich groupBeetles – ~400,000 known species (JBS Haldane: God has “an inordinate fondness for beetles”)
• 538Most numerous birdRed-billed quelea (Africa) – estimated 1.5 billion individuals
• 539Most numerous mammalHumans – ~8.2 billion; or rat if excluding humans
• 540Domestic dogs – number worldwide~900 million
• 541Domestic cats – number worldwide~600 million
• 542Chickens worldwide~34 billion – outnumber humans 4 to 1
• 543Cattle worldwide~1 billion
• 544IUCN Red List – Critically Endangered species (2025)~9,000+ species
• 545Wild tiger population (2025)~5,574 – up from ~3,200 in 2010; conservation success
• 546African elephant statusVulnerable (savanna) and Endangered (forest)
• 547Polar bear statusVulnerable – ~26,000 estimated in wild
• 548Giant panda statusVulnerable – ~1,864 in wild (downlisted from Endangered 2016)
• 549Most recently confirmed extinct large mammalYangtze River dolphin (baiji) – declared functionally extinct 2006
• 550Last dodo died~1681, island of Mauritius
• 551Animal that never drinks waterKoala – gets almost all moisture from eucalyptus leaves (though they do occasionally drink)
• 552Animal with most heartsEarthworm – 5 pairs of aortic arches (pseudo-hearts)
• 553Animal with blue bloodHorseshoe crab, octopus – blood contains copper-based haemocyanin
• 554Only mammal that can flyBats (~1,400 species, ~20% of all mammal species)
• 555Mammal that lays eggsPlatypus and echidna (monotremes)
• 556Largest colony of any animalArgentine ant supercolony extends ~6,000 km across Southern Europe
• 557Octopus intelligenceCan open jars, use tools, recognise individuals, and have distinct personalities
• 558Shark species~500 known species; great white can live 70+ years
• 559TardigradeMicroscopic animal that can survive vacuum of space, extreme radiation, and temperatures from -272C to +150C
• 560Annual species loss estimate~10,000-100,000 species per year (IUCN – wide range due to unknown baseline)

Plants and the Natural World

• 561Known plant species~390,000
• 562Oldest living treeMethuselah, a bristlecone pine in California – ~4,855 years old
• 563Oldest clonal organismPando, a quaking aspen colony in Utah – estimated 80,000+ years old
• 564Tallest treeHyperion, a coastal redwood in California – 115.9 m
• 565Largest tree by volumeGeneral Sherman, giant sequoia – 1,487 m3
• 566Largest flowerRafflesia arnoldii (Borneo) – up to 1 m across, smells of rotting flesh
• 567Smallest flowering plantWolffia (watermeal) – ~1 mm
• 568Fastest growing plantBamboo – some species grow ~91 cm per day
• 569Most poisonous plantCastor bean (ricin source) / water hemlock
• 570Most widely distributed treeMountain birch / trembling aspen across Northern Hemisphere
• 571Deepest roots ever recordedWild fig tree in South Africa – roots at 120 m depth
• 572Amazon rainforestHome to ~10% of all species on Earth; produces ~20% of world’s oxygen
• 573Deforestation rate~10 million hectares of forest lost per year globally (FAO)
• 574Forests cover~31% of Earth’s land area – about 4 billion hectares
• 575Most economically important plantWheat – staple food for ~2.5 billion people
• 576Most widely grown cropSugar cane by weight produced; wheat by area grown
• 577Coffee speciesArabica and Robusta account for ~99% of world coffee production
• 578SeagrassFastest-disappearing ecosystem on Earth; critical carbon sink and fish nursery
• 579PhytoplanktonResponsible for ~50% of all oxygen production on Earth; base of ocean food chain
• 580Oldest known fossilStromatolites – microbial mat fossils ~3.5 billion years old (Australia)
• 581Fungi kingdomNot plants – own kingdom; ~150,000 known species, estimated 3-5 million exist
• 582Largest known fungusHoney fungus in Oregon – covers ~8.9 km2, estimated 8,000 years old
• 583Mycorrhizal networksUnderground fungal networks connect trees, enabling nutrient sharing – the “wood wide web”
• 584Coral bleachingOccurs when water temperatures rise 1-2C above usual maximum; great barrier reef has bleached 6 times since 1998
• 585World tree count~3 trillion trees estimated (Nature 2015 study) – more than previously thought
• 586Trees per person on Earth~422 trees per human (but 15 billion cut down per year)
• 587Longest living organism (non-clonal)Bristlecone pine – Methuselah, ~4,855 years
• 588Plant with most chromosomesAdder’s tongue fern – ~1,260 chromosomes (humans have 46)
• 589Soil~1 teaspoon of healthy soil contains more microorganisms than there are humans on Earth
• 590WetlandsCover ~6% of Earth’s land; store twice as much carbon per hectare as forests

Languages of the World

• 591Languages in the world~7,100 living languages
• 592Languages spoken by 50%+ of peopleOnly 23 languages are spoken by more than 50 million people
• 593Languages endangered~40% of world’s languages have fewer than 1,000 speakers
• 594Language extinction rate~1 language dies every two weeks
• 5951. English (total speakers)~1.5 billion (380 million native)
• 5962. Mandarin Chinese~1.1 billion (920 million native)
• 5973. Hindi~600 million (340 million native)
• 5984. Spanish~560 million (485 million native)
• 5995. French~310 million (80 million native) – spoken on 5 continents
• 6006. Arabic~310 million (274 million native)
• 6017. Bengali~270 million (Bangladesh, India)
• 6028. Russian~255 million
• 6039. Portuguese~250 million – fifth most common first language
• 60410. Urdu~230 million (closely related to Hindi)
• 605Most linguistically diverse countryPapua New Guinea – ~840 languages (~12% of all Earth’s languages)
• 606Most official languages (country)Zimbabwe – 16 official languages
• 607UN official languagesArabic, Chinese, English, French, Russian, Spanish (6)
• 608Oldest written languageSumerian – ~3200 BCE (Mesopotamia, modern Iraq)
• 609Oldest continuously used writing systemChinese characters – ~3,500 years old
• 610Most translated book everThe Bible – ~3,500 languages
• 611Most letters in an alphabetKhmer (Cambodian) – 74 letters
• 612Fewest letters in an alphabetRotokas (Papua New Guinea) – 12 letters
• 613Most widely spoken constructed languageEsperanto – ~2 million speakers
• 614English words in Oxford English Dictionary~600,000 entries
• 615Shakespeare’s vocabulary~20,000-29,000 words used; average educated English speaker uses ~20,000 words
• 616LatinDead as a spoken language but basis of all Romance languages: French, Spanish, Italian, Portuguese, Romanian
• 617Most complex grammarOften cited: Tuyuca (Amazonian) or Hungarian (26 noun cases)
• 618Sign languages~300 distinct sign languages worldwide; not universal
• 619Internet languagesEnglish is ~26% of internet content; Chinese ~25%
• 620Lingua franca of scienceEnglish – ~80%+ of international scientific papers

World Religions

• 621Christianity~2.4 billion adherents (31% of world) – largest religion
• 622Islam~1.9 billion adherents (25%) – fastest growing major religion
• 623Secular / Non-religious~1.2 billion (16%) – fastest growing category in many Western nations
• 624Hinduism~1.2 billion adherents (15%)
• 625Buddhism~500 million adherents (7%)
• 626Folk and traditional religions~430 million adherents (6%)
• 627Judaism~15 million adherents (0.2%) – disproportionately influential culturally and historically
• 628Sikhism~25 million adherents (0.3%) – founded ~15th century, Punjab
• 629Baha’i Faith~8 million adherents – founded 19th century Persia
• 630Jainism~4-6 million adherents – ancient Indian religion, strict non-violence
• 631Christianity founded1st century CE – Middle East; based on teachings of Jesus of Nazareth
• 632Islam founded~610 CE – Arabian Peninsula; Prophet Muhammad received first revelation
• 633Hinduism origin~2000 BCE and earlier – Indian subcontinent; world’s oldest major religion
• 634Buddhism founded~5th century BCE – Nepal/India; Siddhartha Gautama (the Buddha)
• 635Judaism founded~2000 BCE – Middle East; covenant with Abraham
• 636Christian denominations~45,000 worldwide (Catholic, Orthodox, Protestant and countless branches)
• 637Islam branchesSunni (~85-90%), Shia (~10-15%), and smaller groups
• 638Country with most ChristiansUnited States (~230 million)
• 639Country with most MuslimsIndonesia (~230 million) – not a Middle Eastern country
• 640Country with most HindusIndia (~1.1 billion)
• 641Country with most BuddhistsChina (~255 million)
• 642Most secular countryCzech Republic / Estonia frequently cited (~75%+ non-religious)
• 643Most religious countryOften cited: Ethiopia, Niger, Yemen (~99%+ identify with a religion)
• 644UK religion (2021 census)46% Christian – first time below 50%; 37% no religion
• 645Holy city of all three Abrahamic faithsJerusalem
• 646MeccaHoliest city in Islam; only Muslims permitted; ~2.5 million attend Hajj annually
• 647Vatican CityHeadquarters of the Roman Catholic Church; population ~800; smallest country
• 648Dalai LamaSpiritual leader of Tibetan Buddhism; current (14th) is Tenzin Gyatso, born 1935
• 649Largest pilgrimage eventKumbh Mela, India – up to 400 million people over 55 days (2019)
• 650Religion and the law~50 countries have some form of religious law as basis for civil/criminal code

History

• 651Homo sapiens evolved~300,000 years ago (revised upward from earlier estimates)
• 652Out of Africa migration~60,000-70,000 years ago
• 653Agricultural revolution began~10,000 BCE – Fertile Crescent (modern Iraq/Syria/Turkey)
• 654First cities~4000 BCE – Mesopotamia (Uruk, Eridu)
• 655Earliest known writing~3200 BCE – Sumerian cuneiform, Mesopotamia
• 656Pyramids of Giza built~2560-2540 BCE – reign of Pharaoh Khufu
• 657Bronze Age~3300-1200 BCE
• 658Iron Age begins~1200 BCE
• 659Ancient Greece classical period~500-323 BCE
• 660Alexander the Great’s empire336-323 BCE – stretched from Greece to northwestern India
• 661Roman Republic founded509 BCE
• 662Roman Empire founded27 BCE (Augustus Caesar first emperor)
• 663Roman Empire fell (Western)476 CE – Romulus Augustulus deposed
• 664Byzantine Empire (Eastern Roman)Continued until 1453 CE when Constantinople fell to the Ottomans
• 665Silk RoadAncient trade route connecting China to Mediterranean – active ~200 BCE to 1450 CE
• 666Viking Age~793-1066 CE
• 667Magna Carta signed1215 – limited the power of the English King
• 668Black Death in Europe1347-1351 – killed ~30-60% of European population
• 669Gutenberg printing press~1440 – arguably the most disruptive technology before the internet
• 670Columbus reached AmericasOctober 12, 1492
• 671Magellan’s expedition1519-1522 – first circumnavigation of the globe (Magellan died en route)
• 672Copernican revolution1543 – Copernicus: Earth orbits the Sun, not the reverse
• 673Scientific Revolution~1543-1687 (Copernicus to Newton)
• 674Newton’s Principia Mathematica1687 – laws of motion and universal gravitation
• 675American IndependenceJuly 4, 1776
• 676French Revolution1789-1799
• 677Industrial Revolution~1760-1840, Britain – transformed human life more than any prior development since agriculture
• 678Abolition of slavery (UK)1833 – Slavery Abolition Act
• 679Abolition of slavery (USA)1865 – 13th Amendment
• 680Darwin’s On the Origin of Species1859
• 681First World War1914-1918 – ~20 million dead
• 682Spanish Flu1918-1920 – killed ~50-100 million (more than WWI)
• 683Russian Revolution1917 – Bolsheviks; USSR formed 1922
• 684Second World War1939-1945 – ~70-85 million deaths
• 685Holocaust~6 million Jews murdered; ~11 million total including other groups
• 686First nuclear bomb used in warHiroshima, August 6, 1945 (Nagasaki, August 9)
• 687United Nations foundedOctober 24, 1945 – 51 original members
• 688Indian IndependenceAugust 15, 1947 – partition with Pakistan
• 689Israeli state declaredMay 14, 1948
• 690Cold War period1947-1991
• 691Korean War1950-1953 – armistice only; technically still ongoing
• 692Cuban Missile CrisisOctober 1962 – closest Cold War came to nuclear war
• 693Moon landingJuly 20, 1969 – Apollo 11
• 694Vietnam War endedApril 30, 1975 – fall of Saigon
• 695Berlin Wall builtAugust 13, 1961
• 696Berlin Wall fellNovember 9, 1989
• 697Soviet Union dissolvedDecember 25, 1991
• 698Apartheid ended1994 – Nelson Mandela elected President of South Africa
• 6999/11 attacksSeptember 11, 2001 – ~3,000 killed
• 700Global Financial Crisis2007-2009
• 701COVID-19 pandemic declaredMarch 11, 2020 (WHO)
• 702COVID-19 deathsOfficial toll ~7 million; excess deaths estimated 15-20 million
• 703Russia invaded UkraineFebruary 24, 2022 – largest European conflict since WWII
• 704Largest empire in history (area)British Empire – ~24 million km2 at peak (~1920)
• 705Largest empire in history (% of world)Mongol Empire – controlled ~24% of world’s land area (13th-14th century)
• 706Longest reigning monarchLouis XIV of France – 72 years (1643-1715)
• 707Longest reigning British monarchQueen Elizabeth II – 70 years 214 days (1952-2022)
• 708Oldest parliamentAlthing, Iceland – founded 930 CE
• 709Oldest written constitution still in forceUSA Constitution, 1787
• 710Youngest head of state to lead a major countryEmmanuel Macron (France) – elected aged 39 in 2017

Inventions and Firsts

• 711Wheel invented~3500 BCE – Mesopotamia
• 712Paper invented~105 CE – China (Cai Lun)
• 713Gunpowder invented~9th century CE – China
• 714Printing pressGutenberg, ~1440
• 715Telescope inventedHans Lippershey, 1608 (Netherlands)
• 716Steam engine (practical)James Watt, 1769
• 717First railwayStockton to Darlington, England, 1825
• 718Photography inventedLouis Daguerre, 1839
• 719Telephone patentedAlexander Graham Bell, 1876
• 720Electric light bulbThomas Edison, 1879 (Joseph Swan developed independently in UK)
• 721First car (petrol)Karl Benz, 1885 – Benz Patent-Motorwagen
• 722First powered flightWright Brothers, December 17, 1903 – Kitty Hawk, North Carolina – 12 seconds, 36 m
• 723First transatlantic flightAlcock and Brown, June 1919
• 724Penicillin discoveredAlexander Fleming, 1928
• 725First nuclear reactorChicago Pile-1, December 2, 1942 (Enrico Fermi)
• 726Transistor inventedBell Labs, December 16, 1947
• 727First commercial television broadcastsBBC, 1936
• 728DNA structureWatson, Crick, Franklin – 1953
• 729First satellite (Sputnik 1)USSR, October 4, 1957
• 730Laser inventedTheodore Maiman, 1960
• 731Internet precursor (ARPANET)First message sent October 29, 1969
• 732First microprocessorIntel 4004, 1971 – 2,300 transistors
• 733First personal computer (commercial)Altair 8800, 1975; Apple II 1977; IBM PC 1981
• 734First mobile phone callMartin Cooper (Motorola), April 3, 1973
• 735World Wide WebTim Berners-Lee, CERN – first website August 6, 1991
• 736First iPhoneSteve Jobs unveiled January 9, 2007 – released June 29, 2007
• 737First commercially available GPS1993 (US military GPS available to civilians)
• 738First successful IVF babyLouise Brown, UK, July 25, 1978
• 739First heart transplantChristiaan Barnard, South Africa, December 3, 1967
• 740First test of mRNA vaccine technologyClinical trials ~2010; COVID vaccines first approved 2020
• 741Dolly the sheepFirst mammal cloned from adult cell, 1996 (announced 1997)
• 742First cloned human embryo2001 – Advanced Cell Technology (for stem cell research)
• 743Electric battery inventedAlessandro Volta, 1800
• 744Radio inventedMarconi transmitted across Atlantic, 1901
• 745First commercial jet airlinerDe Havilland Comet, 1952 (UK); Boeing 707, 1958
• 746Concorde entered service1976; retired 2003 – we went backwards on speed
• 7473D printing inventedChuck Hull, 1983 (stereolithography)
• 748World’s first general AI chatbot (public)ChatGPT – November 30, 2022; 100 million users in 2 months
• 749Contraceptive pill approved (USA)1960 – one of the most socially transformative inventions of the 20th century
• 750Smallpox vaccineEdward Jenner, 1796 – first vaccine ever; smallpox eradicated 1980

The Global Economy

• 751World GDP total (2024)~$110 trillion
• 7521. USA~$28 trillion GDP
• 7532. China~$18 trillion GDP
• 7543. Germany~$4.5 trillion GDP
• 7554. Japan~$4.2 trillion GDP
• 7565. India~$3.9 trillion GDP – rising fast
• 7576. UK~$3.1 trillion GDP
• 7587. France~$3.0 trillion GDP
• 7598. Italy~$2.3 trillion GDP
• 7609. Brazil~$2.2 trillion GDP
• 76110. Canada~$2.1 trillion GDP
• 762Highest GDP per capitaLuxembourg ~$135,000; Norway ~$100,000
• 763Lowest GDP per capitaBurundi / South Sudan ~$200-$300
• 764Most valuable company (2025)Apple / Microsoft alternating around $3 trillion+
• 765Largest employer (world)US Department of Defense – ~3.2 million employees
• 766Largest private employerWalmart – ~2.1 million employees
• 767Most traded currencyUS Dollar – involved in ~88% of all forex transactions
• 768USD reserve currency status~58% of global foreign exchange reserves held in USD
• 769Gold – largest national reserveUSA – ~8,133 tonnes
• 770Largest stock exchange by market capNYSE – ~$30 trillion
• 771Stock exchanges worldwide~60 major exchanges globally
• 772Global trade in goods (2023)~$24 trillion per year
• 773Largest export economyChina – exports ~$3.4 trillion per year
• 774Most billionairesUSA (~735); China (~495)
• 775Richest individual (2025)Elon Musk ~$300-400bn; fluctuates with Tesla/SpaceX valuations
• 776Gini coefficientMeasure of inequality – South Africa among highest (0.63); Nordic countries lowest (~0.25)
• 777Extreme poverty (World Bank $2.15/day)~700 million people (9% of world) – down from 36% in 1990
• 778Global debt~$315 trillion (IIF 2024) – ~330% of global GDP
• 779Largest sovereign wealth fundNorway Government Pension Fund – ~$1.7 trillion
• 780Most expensive city to live in (2024)Singapore / Zurich / Geneva (Economist Intelligence Unit)
• 781Global oil production (daily)~102 million barrels per day
• 782Largest oil producerUSA (~13 million bpd) – overtook Saudi Arabia around 2018
• 783OPEC members (2025)12 members; Saudi Arabia is largest producer within cartel
• 784Global tourism revenue (2024)~$1.9 trillion – fully recovered post-COVID
• 785Remittances~$860 billion sent home by migrant workers annually – exceeds foreign aid
• 786Global military spending (2023)~$2.4 trillion – highest ever in real terms
• 787Largest military budgetUSA – ~$886 billion (2023)
• 788Global aid flows~$225 billion in official development assistance (OECD, 2022)
• 789Cryptocurrency market cap (2025)~$3 trillion at peak (Bitcoin ~$100k hit late 2024)
• 790Global cloud computing market~$600 billion (2024)

Sport Records

• 791100m world record (men)9.58 seconds – Usain Bolt, Jamaica, Berlin 2009
• 792100m world record (women)10.49 seconds – Florence Griffith-Joyner, USA, 1988
• 793200m world record (men)19.19 seconds – Usain Bolt, 2009
• 794400m world record (men)43.03 seconds – Wayde van Niekerk, South Africa, 2016
• 795Mile world record (men)3:43.13 – Hicham El Guerrouj, Morocco, 1999
• 796Marathon world record (men)2:00:35 – Kelvin Kiptum, Kenya, Chicago 2023
• 797Marathon world record (women)2:09:56 – Ruth Chepngetich, Kenya, Chicago 2024
• 798High jump world record (men)2.45 m – Javier Sotomayor, Cuba, 1993
• 799Long jump world record (men)8.95 m – Mike Powell, USA, 1991
• 800Pole vault world record (men)6.24 m – Armand Duplantis, Sweden, 2024
• 801Shot put world record (men)23.37 m – Ryan Crouser, USA, 2023
• 802Most Olympic gold medals (individual)Michael Phelps, USA – 23 gold medals (28 total)
• 803Most Olympic medals (woman)Larisa Latynina, USSR – 18 medals (gymnastics)
• 804Most FIFA World Cup wins (team)Brazil – 5 (1958, 1962, 1970, 1994, 2002)
• 805Most FIFA World Cup appearancesGermany and Brazil – 8 finals each
• 806Most Grand Slams (men’s tennis)Novak Djokovic – 24
• 807Most Grand Slams (women’s tennis)Serena Williams – 23
• 808Most Wimbledon titles (men)Novak Djokovic – 7
• 809Most Wimbledon titles (women)Martina Navratilova – 9
• 810Most F1 Drivers’ ChampionshipsLewis Hamilton and Michael Schumacher – 7 each
• 811F1 most constructors’ championshipsFerrari – 16
• 812Golf – most Major winsJack Nicklaus – 18
• 813Golf – most Majors (active, 2025)Tiger Woods – 15
• 814Test cricket – most runsSachin Tendulkar (India) – 15,921
• 815Test cricket – most centuriesSachin Tendulkar – 51
• 816Test cricket – most wicketsMuttiah Muralitharan (Sri Lanka) – 800
• 817Premier League – most titlesManchester United – 20
• 818Champions League / European Cup – most winsReal Madrid – 15
• 819Most World Cup goals (men)Miroslav Klose (Germany) – 16
• 820NFL – most Super Bowl wins (team)New England Patriots – 6
• 821NBA – most Championships (team)Boston Celtics – 18 (overtook Lakers 2024)
• 822NBA – most points scored (career)LeBron James – 40,000+ points
• 823Tour de France – most wins (recognised)Eddy Merckx, Bernard Hinault, Miguel Indurain, Jacques Anquetil – 5 each
• 824Rugby Union World Cup – most winsSouth Africa and New Zealand – 4 each
• 825Cricket World Cup – most winsAustralia – 6 (50-over format)
• 826Olympic Games host nations (Summer) – most timesUSA – 4 times (1904, 1932, 1984, 1996)
• 827Most athletes at single OlympicsParis 2024 – ~10,500 athletes
• 828First modern OlympicsAthens, 1896
• 829Largest sports stadiumNarendra Modi Stadium, India – 132,000 capacity
• 830Highest paid athlete annually (peak)Conor McGregor / Cristiano Ronaldo / Lionel Messi – all exceeded $100m in peak years
• 831Most watched annual sporting eventFIFA World Cup final; or Tour de France total viewership
• 832Highest transfer fee (football)Neymar, PSG – 222 million euros (2017)
• 833Fastest tennis serve (men)Sam Groth, Australia – 263.4 km/h (2012)
• 834Fastest cricket ball bowledShoaib Akhtar, Pakistan – 161.3 km/h (2003)
• 835Highest score in Test cricketEngland’s 903/7 declared vs Australia, 1938
• 836Most goals in a calendar yearLionel Messi – 91 goals in 2012
• 837Most international goals (men’s football)Cristiano Ronaldo – 135+ (still active 2025)
• 838Most international goals (women’s football)Christine Sinclair, Canada – 190
• 839Fastest 100m swim (men)49.45 seconds – Caeleb Dressel, USA, 2021
• 840Fastest downhill ski speedIvan Origone, Italy – 254.958 km/h (2016)

Technology in 2025

• 841Internet users worldwide~5.4 billion (66% of world population)
• 842Active websites~1.1 billion (though only ~200 million actively maintained)
• 843Emails sent per day~361 billion
• 844Google searches per day~8.5 billion
• 845Mobile phone subscriptions~8.9 billion – more than one per person
• 846Smartphones in use~6.8 billion
• 847Data created daily (global)~328 million terabytes
• 848Facebook / Meta monthly active users~3.1 billion
• 849YouTube – hours of video watched per day~1 billion hours
• 850YouTube – hours of video uploaded per minute~500 hours
• 851Most visited website (2025)Google.com
• 852Most downloaded app (all time)TikTok
• 853Streaming subscribers (Netflix)~270 million
• 854Most powerful supercomputer (2024)Frontier (Oak Ridge, USA) – 1.1 exaflops (1.1 million trillion calculations per second)
• 855First exascale supercomputerFrontier, 2022 – first machine to exceed 1 exaflop
• 856Transistors in modern CPU~25-100 billion (Apple M3 Ultra: ~192 billion)
• 857Moore’s LawTransistors per chip doubled approximately every 2 years 1965-2010s; now slowing physically
• 858Satellites in orbit (active, 2025)~9,000+ including ~6,000 SpaceX Starlink
• 859Electric vehicles on roads globally~40 million (2024)
• 860EV – % of new car sales globally (2024)~18%
• 861Solar energy cost reductionCost of solar PV fell ~99% between 1976 and 2024
• 862Renewable electricity share (global, 2024)~30%+ of electricity from renewables
• 863Global data centres~8,000 hyperscale and enterprise data centres; consume ~1-2% of global electricity
• 864First commercial 5G networksSouth Korea, 2019
• 8655G coverage (2025)~40% of world population with 5G access
• 866ChatGPT user milestone100 million users in 2 months from launch – fastest product adoption in history
• 867AI models – training computeGPT-4 estimated ~10^25 FLOPs to train; doubling roughly every 6-12 months
• 868Quantum computingGoogle claimed quantum supremacy 2019; IBM Condor 1,121 qubits (2023) – practical applications still limited
• 869Bitcoin energy consumption~140 TWh per year – comparable to Argentina
• 870Largest technology company revenue (2024)Apple – ~$385 billion annual revenue
• 871Amazon Web Services~33% of global cloud infrastructure market
• 872Internet of Things devices (2025)~17 billion connected IoT devices globally
• 873Cybercrime global cost (2024)~$9.5 trillion – if a country, 3rd largest economy
• 874Self-driving vehicles (fully autonomous)Limited deployment in robotaxi form (Waymo in US cities); mass market not yet arrived
• 875SpaceX StarshipLargest rocket ever flown; test flights 2023-2024; designed for Mars missions
• 876Commercial space tourismBlue Origin and Virgin Galactic offering suborbital flights; SpaceX orbital
• 877CRISPR clinical trials~100+ ongoing as of 2025; first approved CRISPR therapy for sickle cell disease (2023)
• 878Brain-computer interfacesNeuralink received FDA approval for human trials 2023; first implant in human 2024
• 879GLP-1 drugs (Ozempic, Wegovy)Semaglutide – approved 2021 for obesity; potentially most prescribed drug class in history by 2030
• 880Nuclear fusionNIF achieved ignition December 2022; commercial fusion power still 10-20+ years away
• 881Battery storageGlobal grid battery storage capacity ~200 GWh (2024) – growing ~50% annually
• 882Global plastic production annually~430 million tonnes
• 883Plastic recycled globally~9% of all plastic ever produced has been recycled
• 884Ocean plastic~170 trillion plastic particles estimated in world’s oceans (2023)
• 885Global water stress~4 billion people face severe water scarcity for at least one month per year
• 886Global food waste~1/3 of all food produced for human consumption is wasted (~1.3 billion tonnes/year)
• 887Air quality – deaths~7 million people die from air pollution annually (WHO) – more than AIDS, TB, and malaria combined
• 888Global vaccination coverage (routine)~85% of children receive core vaccines – up from ~5% in 1974
• 889Polio cases globally (2023)~12 wild poliovirus cases – down from 350,000 per year in 1988
• 890HIV/AIDS (2025)~39 million living with HIV; ~1.3 million new infections per year; antiretroviral treatment available
• 891Cancer mortality trendCancer death rates in high-income countries falling ~1% per year since 1990s
• 892Global antibiotic resistance~1.27 million deaths attributable directly to antimicrobial resistance (2019) – projected to rise sharply
• 893Mental health – global burden~1 billion people live with a mental health condition; depression is leading cause of disability worldwide
• 894Global obesity rate~13% of adults obese (WHO 2022) – tripled since 1975
• 895Global diabetes prevalence~537 million adults with diabetes (2021) – projected 700 million by 2045
• 896Global road deaths annually~1.19 million (WHO) – leading killer of people aged 5-29
• 897Maternal mortality rate (global)~254 per 100,000 live births (2020); was 342 in 2000
• 898Malaria deaths annually~619,000 (WHO 2021) – ~95% in Africa
• 899First malaria vaccineRTS,S/AS01 (Mosquirix) – recommended by WHO 2021; first vaccine for a parasitic disease
• 900Global handwashing~3 billion people lack basic handwashing facilities – one of most cost-effective public health interventions
• 901Sea level rise since 1900~20-23 cm; current rate ~3.7 mm per year (accelerating)
• 902Global average temperature (2024)2024 was the first calendar year to exceed 1.5C above pre-industrial average
• 903Paris Agreement targetLimit warming to 1.5C above pre-industrial; signed 2015; already exceeded in 2024
• 904Arctic warming rateArctic is warming ~4x faster than global average
• 905Arctic sea ice September minimum (2024)~4.3 million km2 – among lowest on record; 1980 average was ~7.5 million km2
• 906Greenland ice sheetLosing ~280 billion tonnes of ice per year
• 907Permafrost~25% of Northern Hemisphere land has permafrost; thawing releases stored methane
• 908Ozone layerAntarctic ozone hole slowly healing – Montreal Protocol (1987) widely regarded as most successful international environmental treaty
• 909Biodiversity – vertebrate populationsAverage vertebrate population sizes declined ~69% since 1970 (WWF Living Planet Report 2022)
• 910Insect biomass decline~75% decline in flying insect biomass over 27 years in protected German areas (2017 study)
• 911Number of nuclear warheads globally (2025)~12,000 – USA and Russia hold ~90%
• 912Nuclear power (global electricity)~10% of global electricity from nuclear
• 913Countries with nuclear weapons9 confirmed: USA, Russia, UK, France, China, India, Pakistan, North Korea, Israel (undeclared)
• 914Hiroshima bomb yield~15 kilotons; modern strategic warheads are typically 100-800 kilotons
• 915Space debris~36,500 pieces of debris larger than 10 cm tracked in orbit; millions of smaller fragments
• 916Human trafficking~25 million people in forced labour globally (ILO) – modern slavery
• 917Global refugee population (2024)~117 million people forcibly displaced – highest ever recorded (UNHCR)
• 918Global access to electricity (2022)~91% of world population – up from ~73% in 2000
• 919People without access to clean water~2 billion lack safely managed drinking water (WHO/UNICEF)
• 920Child marriage~650 million women alive today were married before age 18
• 921Global literacy rate (2025)~87% – up from ~67% in 1975
• 922Girls in secondary education~90% in high-income countries; ~60% in low-income countries
• 923Women in national parliaments (2025)~27% globally – up from ~11% in 1975
• 924Countries with female heads of government ever~100 countries have had a female head of state or government
• 925Same-sex marriage legal in~35 countries as of 2025
• 926Death penalty abolished in~112 countries; retained in ~55; USA still uses it in some states
• 927Press freedom~43% of people live in countries with little or no press freedom (RSF 2024)
• 928Democracy index~45% of world’s population lives in a democracy of some kind (EIU 2023)
• 929Average global school years (adults)~8.6 years of schooling – up from ~3.7 in 1950
• 930Global spending on education~$5.5 trillion per year
• 931Books published annually (global)~4 million new titles per year
• 932Best-selling book of all timeThe Bible (~5 billion copies); Don Quixote (~500 million) is often cited as most translated novel
• 933Best-selling fiction seriesHarry Potter – ~600 million copies
• 934Most listened to music artist (Spotify)Taylor Swift – most streamed artist 2023 (~93 billion streams)
• 935Best-selling album of all timeMichael Jackson’s Thriller – ~70 million copies
• 936Most listened to song of all time (streams)Blinding Lights – The Weeknd; older records not directly comparable
• 937Classical composers – most performedBeethoven, Mozart, and Bach dominate concert programmes globally
• 938Museum visitors – most in the worldLouvre, Paris – ~9 million per year
• 939Most visited monumentGreat Wall of China – ~10 million visitors per year
• 940Most photographed buildingEiffel Tower, Paris – completed 1889; was supposed to be temporary
• 941Highest grossing film of all timeAvatar (2009) – ~$2.92 billion
• 942Most Oscars won (film)Ben-Hur (1959), Titanic (1997), Return of the King (2003) – 11 each
• 943Largest film industry by outputBollywood (India) – produces ~1,500-2,000 films per year vs Hollywood ~400-500
• 944Most watched TV event everSuper Bowl; FIFA World Cup finals typically 700-800 million+ viewers globally
• 945Video game industry revenue (2024)~$200 billion – larger than film and music combined
• 946Best-selling video game of all timeMinecraft – ~300 million copies
• 947Number of professional esports players~7,000 professionals; global esports audience ~540 million
• 948Nobel Prizes awarded since 1901~700 prizes; ~60 to women
• 949Youngest Nobel laureateMalala Yousafzai – Peace Prize 2014, aged 17
• 950Country with most Nobel PrizesUSA – ~400 laureates
• 951Archaeological find of 20th centuryTutankhamun’s tomb – discovered 1922 by Howard Carter
• 952Dead Sea Scrolls discovered1947 – oldest known surviving manuscripts of Old Testament texts
• 953Longest wall ever builtGreat Wall of China – ~21,196 km (including all sections)
• 954Oldest universityUniversity of Bologna, Italy – founded 1088
• 955Oldest university in UKOxford University – teaching from ~1096
• 956Most spoken language on the internetEnglish (~26%) followed closely by Chinese (~25%)
• 957Countries without an army~22 countries including Iceland, Costa Rica, Panama, Vatican City
• 958Largest army (active personnel)China – ~2 million active personnel
• 959Longest running peace treatySwiss neutrality maintained continuously since 1815 Congress of Vienna
• 960Antarctica TreatySigned 1959; 54 parties; prohibits military activity and nuclear testing; no country owns Antarctica

More Technology and the Modern World

• 961Spotify subscribers (2024)~250 million premium; ~600 million total monthly active users
• 962Instagram monthly users~2 billion
• 963TikTok monthly users~1.6 billion
• 964WhatsApp monthly users~3 billion
• 965Amazon packages shipped annually~5 billion Prime packages in USA alone
• 966Air passengers per year (2024)~4.5 billion – exceeding pre-COVID record
• 967Busiest airportHartsfield-Jackson Atlanta – ~104 million passengers per year
• 968Busiest shipping portShanghai – ~49 million TEUs per year
• 969Container ships – largestMSC Irina – 24,346 TEU capacity (2023)
• 970Fastest passenger trainShanghai Maglev – operational top speed 431 km/h
• 971Japan Shinkansen record603 km/h (test speed, 2015 MLX01 maglev)
• 972World’s longest roadPan-American Highway – ~48,000 km (with a gap in the Darien)
• 973World’s longest rail networkUSA – ~250,000 km (mostly freight)
• 974World’s longest underground metroShanghai Metro – ~831 km
• 975London UndergroundOpened 1863 – world’s first underground railway; ~272 stations
• 976GPS satellites in orbit31 operational US GPS satellites; Russia (GLONASS), EU (Galileo) and China (BeiDou) also operate their own
• 977Internet of Things (IoT) devices~17 billion connected IoT devices globally; projected 30 billion+ by 2030
• 978IPv4 exhaustionIPv4 addresses (4.3 billion) effectively exhausted; IPv6 has 340 trillion trillion trillion addresses
• 979Undersea internet cables~600 submarine cables carry ~99% of international internet traffic
• 980Starlink~6,000 satellites providing internet to 100+ countries; ~3 million subscribers (2024)
• 981Wikipedia~67 million articles in 334 languages; ~3 billion monthly unique visitors
• 982Most common password (consistently)“123456” – please do not use this
• 983World’s largest data hack (by accounts)Yahoo – 3 billion accounts (2013-2014)
• 984Global cybersecurity market~$200 billion (2024)
• 985Autonomous weaponsAI-enabled weapons systems now deployed by multiple militaries; no international treaty yet
• 986Robotics – industrial robots installed globally~3.9 million (IFR 2023) – up 40% in five years
• 9873D printing in medicineCustom implants, surgical guides, hearing aids – ~97% of hearing aids globally are 3D printed
• 988Lab-grown meatFirst lab-grown beef burger eaten publicly 2013; approved for sale in Singapore 2020, USA 2023
• 989Global internet speed average (2024)~60 Mbps fixed broadband; ~30 Mbps mobile
• 990Countries with fastest average internetSingapore, UAE, Hong Kong, South Korea routinely top global speed tables
• 991Countries with slowest internetSub-Saharan Africa and parts of South/Southeast Asia
• 992Digital divide~2.6 billion people still have no internet access – largely in rural Africa and South Asia
• 993E-commerce global revenue (2024)~$6 trillion
• 994Largest e-commerce companyAmazon (US/global); Alibaba (China)
• 995Remote work shift post-COVID~12% of workers in high-income countries work fully remotely; ~28% hybrid
• 996Global average working hours per year~1,700 – ranges from ~1,400 (Germany) to ~2,200 (Mexico)
• 997World Happiness Report – top country (2024)Finland – 7th consecutive year at top (2018-2024)
• 998Human Development Index top (2023)Switzerland, Norway, Iceland
• 999The question worth askingFor all these 999 facts, the ones that matter most are not the records or the extremes but the trends – what is rising, what is falling, and what are we doing about it
• 1000The one constantThe most important thing worth knowing changes with every generation. Pass it on.

50 Things That Changed in 50 Years: 1975 vs 2025

A half century. Some of these numbers are cause for quiet pride. Some should keep you up at night. None of them are small.

Sources: UN, World Bank, Our World in Data, NASA, IUCN, WHO, Ericsson Mobility Report, Oxford English Dictionary, CIA World Factbook, IEA, UNHCR, Freedom House, ILO, FAO, GSA, WWF, IPCC. Figures are approximate and represent the best available data at time of writing. Population and economic data in particular changes continuously.