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Every fact on factsmate is backed by named, linkable sources. Here’s everyone we cite.

HISTORY media history.com 217 facts
Encyclopædia Britannica Encyclopedia britannica.com 204 facts
NASA Space agency nasa.gov 107 facts
EBSCO Research Starters institution ebsco.com 105 facts
U.S. National Archives government archives.gov 102 facts
U.S. National Park Service Government nps.gov 94 facts
NASA Science Space agency science.nasa.gov 92 facts
Smithsonian National Air and Space Museum Museum / research institution airandspace.si.edu 80 facts
National Library of Medicine (PMC) Government medical library pmc.ncbi.nlm.nih.gov 68 facts
U.S. Department of State, Office of the Historian government history.state.gov 65 facts
Guinness World Records reference guinnessworldrecords.com 63 facts
Royal Museums Greenwich institution rmg.co.uk 46 facts
European Space Agency Space agency esa.int 44 facts
Smithsonian Magazine webpage smithsonianmag.com 43 facts
The Nobel Prize Prize institution nobelprize.org 39 facts
National Center for Biotechnology Information (NLM) academic ncbi.nlm.nih.gov 38 facts
World History Encyclopedia history reference worldhistory.org 33 facts
Linda Hall Library article lindahall.org 32 facts
National Geographic Science media nationalgeographic.com 28 facts
Wikipedia Community encyclopedia en.wikipedia.org 28 facts
Scientific American Science media scientificamerican.com 27 facts
Computer History Museum institution computerhistory.org 26 facts
Imperial War Museums Museum / research iwm.org.uk 26 facts
Space.com Science news outlet space.com 26 facts
MacTutor History of Mathematics University archive mathshistory.st-andrews.ac.uk 25 facts
The National WWII Museum Museum / research nationalww2museum.org 23 facts
Nature Peer-reviewed journal nature.com 21 facts
The National Archives (UK) national archive nationalarchives.gov.uk 20 facts
Google Patents — US1125476A patent record patents.google.com 19 facts
PubMed (U.S. National Library of Medicine) academic pubmed.ncbi.nlm.nih.gov 19 facts
arXiv Peer-reviewed paper arxiv.org 18 facts
American Battlefield Trust article battlefields.org 17 facts
LacusCurtius (University of Chicago) academic resource penelope.uchicago.edu 17 facts
PBS Public broadcasting / documentary pbs.org 17 facts
The Planetary Society nonprofit space institution planetary.org 17 facts
Encyclopedia.com reference encyclopedia.com 16 facts
NOAA National Ocean Service government oceanservice.noaa.gov 15 facts
Origins (Ohio State University & Miami University) article origins.osu.edu 15 facts
Space Center Houston science institution spacecenter.org 15 facts
National Army Museum national museum nam.ac.uk 14 facts
The Royal Household official biography royal.uk 14 facts
United Nations institution un.org 14 facts
United States Holocaust Memorial Museum institution ushmm.org 14 facts
Westminster Abbey abbey / institution westminster-abbey.org 14 facts
Yale Law School, Avalon Project academic avalon.law.yale.edu 14 facts
National Constitution Center constitutional institution constitutioncenter.org 13 facts
This Day in Aviation aviation history site thisdayinaviation.com 13 facts
American Physical Society scientific society aps.org 12 facts
Astronomy Magazine magazine astronomy.com 12 facts
National Institute of Standards and Technology (NIST) Government metrology lab nist.gov 12 facts
ScienceDaily reference sciencedaily.com 12 facts
The Henry Ford - The First Indianapolis 500, 1911 institution thehenryford.org 12 facts
U.S. Census Bureau government agency census.gov 12 facts
Internet History Sourcebooks (Fordham University) academic sourcebooks.fordham.edu 11 facts
National Geographic Education Educational resource education.nationalgeographic.org 11 facts
The Conversation academic theconversation.com 11 facts
U.S. Department of Energy Government science office energy.gov 11 facts
CBS News media cbsnews.com 10 facts
Encyclopedia Virginia (Virginia Humanities) institution encyclopediavirginia.org 10 facts
legislation.gov.uk (The National Archives) government legislation.gov.uk 10 facts
National Weather Service (NOAA) Government weather agency weather.gov 10 facts
Science History Institute science research institute sciencehistory.org 10 facts
The American Presidency Project (UC Santa Barbara) academic archive presidency.ucsb.edu 10 facts
U.S. National Library of Medicine government nlm.nih.gov 10 facts
Centers for Disease Control and Prevention government cdc.gov 9 facts
CERN institution home.cern 9 facts
Google Arts & Culture institution artsandculture.google.com 9 facts
National Inventors Hall of Fame institution invent.org 9 facts
National Security Archive (George Washington University) university research archive nsarchive.gwu.edu 9 facts
Science Museum (UK) museum sciencemuseum.org.uk 9 facts
Stanford Encyclopedia of Philosophy academic plato.stanford.edu 9 facts
The Mariners' Museum and Park maritime museum marinersmuseum.org 9 facts
UNESCO institution unesco.org 9 facts
MIT News University news.mit.edu 8 facts
NASA Jet Propulsion Laboratory National lab jpl.nasa.gov 8 facts
National Human Genome Research Institute government genome.gov 8 facts
National Women's History Museum institution womenshistory.org 8 facts
PBS media pbs.org 8 facts
Teachers College, Columbia University university library library.tc.columbia.edu 8 facts
World Health Organization government who.int 8 facts
Cambridge University Press Peer-reviewed journal cambridge.org 7 facts
Florida Museum of Natural History museum education resource floridamuseum.ufl.edu 7 facts
Harvard University official history timeline harvard.edu 7 facts
Historic UK specialist history site historic-uk.com 7 facts
Johns Hopkins Applied Physics Laboratory Research institution jhuapl.edu 7 facts
Lemelson-MIT Program institution lemelson.mit.edu 7 facts
Live Science media livescience.com 7 facts
Miller Center, University of Virginia academic presidential archive millercenter.org 7 facts
MoneyWeek news moneyweek.com 7 facts
National High Magnetic Field Laboratory research institute nationalmaglab.org 7 facts
Online Etymology Dictionary reference etymonline.com 7 facts
Our World in Data: Urbanization analysis ourworldindata.org 7 facts
Oxford University Press (OUPblog) academic blog.oup.com 7 facts
Physics Today (American Institute of Physics) scientific publication physicstoday.aip.org 7 facts
Pitt Rivers Museum, University of Oxford — Revolving musket museum ox.ac.uk 7 facts
PLOS academic journals.plos.org 7 facts
Ronald Reagan Presidential Library (NARA) government archive reaganlibrary.gov 7 facts
Royal Society of Chemistry Learned society periodic-table.rsc.org 7 facts
Smithsonian — Lemelson Center, Invention Stories institution invention.si.edu 7 facts
South African History Online institution sahistory.org.za 7 facts
The Holy See (Vatican) Official Vatican / papal address vatican.va 7 facts
U.S. Army government army.mil 7 facts
U.S. Department of Energy (OSTI) government osti.gov 7 facts
U.S. Geological Survey Government science agency usgs.gov 7 facts
World Athletics - Men's 100m All-Time Top List institution worldathletics.org 7 facts
Apollo Flight Journal annotated NASA mission transcripts (NASA History-endorsed) apollojournals.org 6 facts
Arms Control Association article armscontrol.org 6 facts
English Heritage heritage institution article english-heritage.org.uk 6 facts
German History in Documents and Images (German Historical Institute) academic history archive germanhistorydocs.org 6 facts
GovInfo (U.S. Government Publishing Office) government agency govinfo.gov 6 facts
IEEE Spectrum webpage spectrum.ieee.org 6 facts
Legal Information Institute, Cornell Law School reference law.cornell.edu 6 facts
Library of Congress government report loc.gov 6 facts
London Museum museum article londonmuseum.org.uk 6 facts
McGill University Office for Science and Society academic mcgill.ca 6 facts
MedlinePlus Genetics (U.S. National Library of Medicine) government medlineplus.gov 6 facts
NASA StarChild Space agency starchild.gsfc.nasa.gov 6 facts
National Institute on Deafness and Other Communication Disorders (NIH) government nidcd.nih.gov 6 facts
NOAA National Centers for Environmental Information government ncei.noaa.gov 6 facts
Parks Canada government parks.canada.ca 6 facts
Phys.org academic phys.org 6 facts
Rice University university rice.edu 6 facts
Smithsonian Insider — Apple "Classic" Macintosh Personal Computer, 1984 museum si.edu 6 facts
Society for American Baseball Research academic sabr.org 6 facts
The Royal Society learned society royalsociety.org 6 facts
U.S. Geological Survey — The Severity of an Earthquake Government pubs.usgs.gov 6 facts
AFI Catalog (American Film Institute) institution catalog.afi.com 5 facts
American Society of Civil Engineers institution asce.org 5 facts
Anne Frank House historical institution / museum annefrank.org 5 facts
BrainFacts.org (Society for Neuroscience) institution brainfacts.org 5 facts
British Library national library bl.uk 5 facts
Caltech University caltech.edu 5 facts
EarthSky media earthsky.org 5 facts
ESA/Hubble Space agency esahubble.org 5 facts
GOV.UK official UK government history page gov.uk 5 facts
JSTOR Daily reference daily.jstor.org 5 facts
Los Alamos National Laboratory Periodic table element reference periodic.lanl.gov 5 facts
Max Planck Society Research institute press release on the Nature study mpg.de 5 facts
National Baseball Hall of Fame institution baseballhall.org 5 facts
National Institutes of Health peer-reviewed journal (PubMed Central) nih.gov 5 facts
National Science and Media Museum institution scienceandmediamuseum.org.uk 5 facts
New Mexico Museum of Space History museum biography nmspacemuseum.org 5 facts
NPR media npr.org 5 facts
Pew Research Center institution pewresearch.org 5 facts
Quanta Magazine Science journalism quantamagazine.org 5 facts
Science Museum Group reference collection.sciencemuseumgroup.org.uk 5 facts
Tennessee Encyclopedia (Tennessee Historical Society) reference encyclopedia tennesseeencyclopedia.net 5 facts
The History of Parliament parliamentary research institution historyofparliament.com 5 facts
Transportation History history article transportationhistory.org 5 facts
U.S. EPA, Exxon Valdez Spill Profile government agency epa.gov 5 facts
University of Cambridge academic cam.ac.uk 5 facts
Victoria and Albert Museum museum collections.vam.ac.uk 5 facts
WorldAtlas reference worldatlas.com 5 facts
Archaeology Magazine (Archaeological Institute of America) article archaeology.org 4 facts
Atomic Heritage Foundation / National Museum of Nuclear Science & History museum / research institution nuclearmuseum.org 4 facts
BBC History media bbc.co.uk 4 facts
Cambridge University Library academic library lib.cam.ac.uk 4 facts
Center for Arms Control and Non-Proliferation research institution fact sheet armscontrolcenter.org 4 facts
Christian History Institute institution christianhistoryinstitute.org 4 facts
Classic FM media classicfm.com 4 facts
Cleveland Clinic institution my.clevelandclinic.org 4 facts
De Imperatoribus Romanis (Loyola University Chicago) Academic online encyclopedia of Roman emperors roman-emperors.sites.luc.edu 4 facts
European Southern Observatory intergovernmental observatory eso.org 4 facts
European Space Agency government sci.esa.int 4 facts
Geophysical Journal International (Oxford University Press) peer-reviewed geophysics journal academic.oup.com 4 facts
Hagley Museum and Library museum and library hagley.org 4 facts
Harry Ransom Center, University of Texas at Austin institution hrc.utexas.edu 4 facts
Harvard Gazette university news.harvard.edu 4 facts
HistoryNet history media historynet.com 4 facts
HistoryPod — Greenwich time signal pips broadcast by the BBC history media historypod.net 4 facts
Liberty, Equality, Fraternity (Roy Rosenzweig Center for History and New Media) university research center primary-source archive revolution.chnm.org 4 facts
Lumen Learning open academic course material courses.lumenlearning.com 4 facts
MIT News — Riddle solved: Why was Roman concrete so durable? university research news mit.edu 4 facts
NASA Eclipse Web Site government eclipse.gsfc.nasa.gov 4 facts
NASA Goddard Imagine the Universe government imagine.gsfc.nasa.gov 4 facts
NASA Technical Reports Server peer-reviewed research ntrs.nasa.gov 4 facts
National Institute of General Medical Sciences (NIH) government nigms.nih.gov 4 facts
National Museums Scotland museum nms.ac.uk 4 facts
NOAA Ocean Exploration government oceanexplorer.noaa.gov 4 facts
Perseus Digital Library (Tufts University) Academic digital library perseus.tufts.edu 4 facts
Physics World physics magazine physicsworld.com 4 facts
Princeton University academic library princeton.edu 4 facts
Science Museum Group article sciencemuseumgroup.org.uk 4 facts
Science News science media sciencenews.org 4 facts
Shakespeare Birthplace Trust institution shakespeare.org.uk 4 facts
Texas State Historical Association encyclopedia tshaonline.org 4 facts
Texas State Library and Archives Commission state archive tsl.texas.gov 4 facts
The Mob Museum — St. Valentine's Day Massacre Wall museum themobmuseum.org 4 facts
The Morgan Library & Museum institution themorgan.org 4 facts
U.S. Capitol Visitor Center — Greenbacks (United States notes) issued March 10, 1862 government visitthecapitol.gov 4 facts
UCLA Division of Astronomy (Ned Wright's Cosmology FAQ) University astronomy department astro.ucla.edu 4 facts
UK Government History of Government blog government history blog history.blog.gov.uk 4 facts
UK Parliament (Hansard) parliamentary record api.parliament.uk 4 facts
UNESCO Intangible Cultural Heritage institution ich.unesco.org 4 facts
UNFPA, State of World Population 2023 report unfpa.org 4 facts
United States Holocaust Memorial Museum government encyclopedia encyclopedia.ushmm.org 4 facts
Woods Hole Oceanographic Institution institution whoi.edu 4 facts
American Institute of Physics (Center for History of Physics) physics history institute history.aip.org 3 facts
Apple Newsroom — Apple Reinvents the Phone with iPhone press release apple.com 3 facts
Asia for Educators, Columbia University academic afe.easia.columbia.edu 3 facts
Audubon Field Guide institution audubon.org 3 facts
Australian Museum — What is a monotreme? institution australian.museum 3 facts
Ben's Guide to the U.S. Government (GPO) government agency bensguide.gpo.gov 3 facts
Bureau International des Poids et Mesures (BIPM) intergovernmental metrology organization bipm.org 3 facts
CERN Timeline — Sir Berners-Lee announces the WWW software on the Internet research institution web.cern.ch 3 facts
Chandra X-ray Observatory reference chandra.harvard.edu 3 facts
Comite International Pierre de Coubertin institution coubertin.org 3 facts
Cornell University ILR School, The Triangle Factory Fire academic project cornell.edu 3 facts
D23 — Donald Duck Debuts in The Wise Little Hen official Disney fan club / archive d23.com 3 facts
Deutschland.de official country portal deutschland.de 3 facts
Directory of American Tool and Machinery Patents (DATAMP) patent reference database datamp.org 3 facts
EARTH Magazine (American Geosciences Institute) geoscience institute earthmagazine.org 3 facts
Egypt Ministry of Tourism and Antiquities Government egymonuments.gov.eg 3 facts
Eisenhower Presidential Library government archive eisenhowerlibrary.gov 3 facts
Encyclopaedia of Portuguese Expansion (NOVA FCSH) university research project eve.fcsh.unl.pt 3 facts
Encyclopedia of Alabama encyclopedia encyclopediaofalabama.org 3 facts
European History Online (EGO), Leibniz Institute of European History academic ieg-ego.eu 3 facts
Exchange History (Capital Amsterdam Foundation) Financial-history research foundation beursgeschiedenis.nl 3 facts
FIFA - 5 billion engaged with the FIFA World Cup Qatar 2022 institution inside.fifa.com 3 facts
Folger Shakespeare Library — Letter describing the burning of the Globe research library folger.edu 3 facts
Fondation Napoléon institution napoleon.org 3 facts
Georgia Historical Society institution georgiahistory.com 3 facts
German Patent and Trade Mark Office (DPMA) government dpma.de 3 facts
Grace's Guide — Big Ben engineering reference gracesguide.co.uk 3 facts
Griswold v. Connecticut (1965), Supreme Court Historical Society institution explainer supremecourthistory.org 3 facts
History Hit history media outlet historyhit.com 3 facts
History of Vaccines (College of Physicians of Philadelphia) medical history institution historyofvaccines.org 3 facts
HyperPhysics (Georgia State University) educational reference hyperphysics.gsu.edu 3 facts
IFLScience media iflscience.com 3 facts
International Churchill Society — Churchill, Watson-Watt and the Development of Radar historical institution winstonchurchill.org 3 facts
Jamestown Rediscovery (Preservation Virginia) institution historicjamestowne.org 3 facts
Journal of Experimental Biology academic journals.biologists.com 3 facts
Larousse reference larousse.fr 3 facts
Lawrence Berkeley National Laboratory National lab newscenter.lbl.gov 3 facts
Library of Congress national library research guide guides.loc.gov 3 facts
Library of Congress national library blog blogs.loc.gov 3 facts
LibreTexts academic libretexts.org 3 facts
Livius.org reference livius.org 3 facts
Lord's / MCC institution lords.org 3 facts
Lowell Observatory institution lowell.edu 3 facts
Mass Humanities (Mass Moments) historical institution massmoments.org 3 facts
Massachusetts Historical Society historical society / research institution masshist.org 3 facts
Max Planck Institute for Psycholinguistics institution mpi.nl 3 facts
MNopedia — Minnesota Historical Society institution mnhs.org 3 facts
Musée du Louvre institution louvre.fr 3 facts
Museo Galileo Museum of the history of science museogalileo.it 3 facts
Napoléon & Empire historical reference napoleon-empire.org 3 facts
NASA Space Place agency page spaceplace.nasa.gov 3 facts
National Museum of Racing and Hall of Fame article racingmuseum.org 3 facts
National Radio Astronomy Observatory Research observatory public.nrao.edu 3 facts
National Records of Scotland national archive education resource scottisharchivesforschools.org 3 facts
National Security Archive, George Washington University academic archive nsarchive2.gwu.edu 3 facts
National September 11 Memorial & Museum memorial museum 911memorial.org 3 facts
National WWI Museum and Memorial museum theworldwar.org 3 facts
New World Encyclopedia reference newworldencyclopedia.org 3 facts
Newcastle University university press office ncl.ac.uk 3 facts
NOAA Damage Assessment, Remediation, and Restoration Program government agency noaa.gov 3 facts
NOAA Fisheries government fisheries.noaa.gov 3 facts
Northwestern University academic northwestern.edu 3 facts
OEIS Foundation (On-Line Encyclopedia of Integer Sequences) mathematical database oeis.org 3 facts
Plimoth Patuxet Museums reference plimoth.org 3 facts
Science Museum National museum blog.sciencemuseum.org.uk 3 facts
Smithsonian's National Zoo & Conservation Biology Institute institution nationalzoo.si.edu 3 facts
Springfield College - Birthplace of Basketball academic springfield.edu 3 facts
SRI International research institute sri.com 3 facts
SS Great Britain — Historic Mechanical Engineering Landmark Engineering society landmark record asme.org 3 facts
Teaching American History institution teachingamericanhistory.org 3 facts
The Art Newspaper media theartnewspaper.com 3 facts
The Battlefields Trust heritage organization battlefieldstrust.com 3 facts
The First Class of the World Video Game Hall of Fame museum / hall of fame museumofplay.org 3 facts
The Linnean Society — Naming Nature article linnean.org 3 facts
The Mariners' Museum museum exploration.marinersmuseum.org 3 facts
The Museum of Flight aviation museum museumofflight.org 3 facts
U.S. Olympic & Paralympic Museum museum usopm.org 3 facts
UC Riverside Physics FAQ (John Baez) academic math.ucr.edu 3 facts
University of Alaska Fairbanks Geophysical Institute — Alaska Science Forum academic gi.alaska.edu 3 facts
University of Chicago News University news.uchicago.edu 3 facts
Utah Geological Survey government survey geology.utah.gov 3 facts
Victoria and Albert Museum institution vam.ac.uk 3 facts
Yale University university news.yale.edu 3 facts
Zinn Education Project educational organization zinnedproject.org 3 facts
'It was like a blubber snowstorm' — OPB public broadcasting opb.org 2 facts
AAAS / Science article aaas.org 2 facts
Agatha Christie Limited (official) institution agathachristie.com 2 facts
Air Force Historical Foundation article afhistory.org 2 facts
American Academy of Ophthalmology institution aao.org 2 facts
American Heritage history magazine americanheritage.com 2 facts
American Historical Association Professional association historians.org 2 facts
American Oil & Gas Historical Society — Nylon, a Petroleum Polymer historical society aoghs.org 2 facts
Archaeology Magazine (Archaeological Institute of America) institution archive.archaeology.org 2 facts
Architect of the Capitol government aoc.gov 2 facts
Archontology.org reference database of officeholders archontology.org 2 facts
Atomic Archive Reference (history of nuclear weapons) atomicarchive.com 2 facts
Atomic Heritage Foundation / National Museum of Nuclear Science & History museum history article ahf.nuclearmuseum.org 2 facts
Automotive History history site automotivehistory.org 2 facts
Babbel Magazine media babbel.com 2 facts
BBC News news bbc.com 2 facts
BBC Science Focus Magazine media sciencefocus.com 2 facts
Berlin Wall Foundation (Stiftung Berliner Mauer) memorial foundation / research institution stiftung-berliner-mauer.de 2 facts
Bibliothèque nationale de France (BnF) institution bnf.fr 2 facts
Bombay Sarvodaya Mandal & Gandhi Research Foundation (mkgandhi.org) archive mkgandhi.org 2 facts
British Film Institute national film institute bfi.org.uk 2 facts
British Geological Survey national geoscience agency bgs.ac.uk 2 facts
British History Online (University of London) academic british-history.ac.uk 2 facts
Brookings Institution Analysis article brookings.edu 2 facts
Brown University Library academic library library.brown.edu 2 facts
Bryn Mawr Classical Review Academic book review bmcr.brynmawr.edu 2 facts
Buseck Center for Meteorite Studies, Arizona State University research center meteorites.asu.edu 2 facts
California State Parks: California Admission Day government parks.ca.gov 2 facts
Captain Cook Society historical society captaincooksociety.com 2 facts
Centre for Computing History — Barclays Bank installs the first cash dispenser museum computinghistory.org.uk 2 facts
CERN Courier institutional journal cerncourier.com 2 facts
Charles M. Schulz Museum — Frequently Asked Questions webpage schulzmuseum.org 2 facts
Charlotte Symphony — Things you didn't know about Beethoven's Symphony No. 9 performing arts institution charlottesymphony.org 2 facts
Cornell Chronicle university news news.cornell.edu 2 facts
CSIRO — Monitoring our vast and varied coasts article csiro.au 2 facts
Darwin Correspondence Project — Voyage of HMS Beagle (University of Cambridge) academic darwinproject.ac.uk 2 facts
Death Penalty Information Center nonprofit research institution deathpenaltyinfo.org 2 facts
Dictionary of National Biography (Wikisource) reference work wikisource.org 2 facts
Dictionary.com media dictionary.com 2 facts
Embryo Project Encyclopedia (Arizona State University) academic encyclopedia embryo.asu.edu 2 facts
Engineering and Technology History Wiki (IEEE) engineering history archive ethw.org 2 facts
Eos (American Geophysical Union) geophysical union publication eos.org 2 facts
Equal Justice Initiative legal nonprofit institute eji.org 2 facts
European Parliament — The Maastricht Treaty government europarl.europa.eu 2 facts
Everest at 70 — Sedgwick Museum of Earth Sciences, University of Cambridge University museum exhibition sedgwickmuseum.cam.ac.uk 2 facts
Florida Center for Instructional Technology, University of South Florida academic resource fcit.usf.edu 2 facts
Florida Historical Society historical society myfloridahistory.org 2 facts
Folger Shakespeare Library research library archive shakespearedocumented.folger.edu 2 facts
Food and Agriculture Organization of the UN government fao.org 2 facts
Franklin D. Roosevelt Presidential Library (National Archives) national archive fdr.blogs.archives.gov 2 facts
Galleria dell'Accademia di Firenze: Basic Facts about Michelangelo's David museum accademia.org 2 facts
Gallica (Bibliotheque nationale de France) national library gallica.bnf.fr 2 facts
George W. Bush White House Archives government georgewbush-whitehouse.archives.gov 2 facts
Gerald R. Ford Presidential Library & Museum — The Watergate Files Presidential library exhibit (primary documents) fordlibrarymuseum.gov 2 facts
German Aerospace Center (DLR) national space agency dlr.de 2 facts
Getlink / Eurotunnel (concessionaire-operator) institution getlinkgroup.com 2 facts
Graceland (official Elvis Presley estate) institution graceland.com 2 facts
Greek Reporter news greekreporter.com 2 facts
Gresham College higher-education institution gresham.ac.uk 2 facts
Harvard Health Publishing institution health.harvard.edu 2 facts
Harvey Mudd College (Math Fun Facts) Mathematics department educational resource math.hmc.edu 2 facts
Historic England government heritagecalling.com 2 facts
Historic Environment Scotland national heritage body / battlefields inventory portal.historicenvironment.scot 2 facts
History Facts — Sweden switched from driving on the left to the right media historyfacts.com 2 facts
History Today history magazine historytoday.com 2 facts
Hohe Domkirche Köln (Cologne Cathedral) official cathedral administration koelner-dom.de 2 facts
Hudson River Maritime Museum — Captain William Kidd article hrmm.org 2 facts
HyperPhysics (Georgia State University) university reference hyperphysics.phy-astr.gsu.edu 2 facts
IBM corporate history archive ibm.com 2 facts
Immaculate Conception Defined by Pius IX encyclopedia ewtn.com 2 facts
Indiana Historical Bureau (in.gov) government agency in.gov 2 facts
Ineffabilis Deus (full text, 1854) primary document newadvent.org 2 facts
International Boundary Commission government internationalboundarycommission.org 2 facts
International Energy Agency — World Energy Outlook 2020 government iea.org 2 facts
Internet Archive digital library archival record archive.org 2 facts
Internet Encyclopedia of Philosophy peer-reviewed reference iep.utm.edu 2 facts
Intrepid Museum webpage intrepidmuseum.org 2 facts
Italian Art Society — Leonardo da Vinci was born on 15 April 1452, in Anchiano, near Vinci scholarly society article italianartsociety.org 2 facts
James Lind Library Scholarly resource jameslindlibrary.org 2 facts
Kentucky Derby (official) official kentuckyderby.com 2 facts
Kon-Tiki Museum museum kon-tiki.no 2 facts
Lancaster University university lancaster.ac.uk 2 facts
Lawrence Livermore National Laboratory national laboratory st.llnl.gov 2 facts
Library of Congress Country Studies national reference study countrystudies.us 2 facts
LibreTexts Chemistry academic lecture demonstration chem.libretexts.org 2 facts
LLILAS Benson, University of Texas at Austin university magazine utexas.edu 2 facts
Los Angeles Philharmonic orchestra program notes laphil.com 2 facts
Lowell Observatory Archives Observatory archive exhibit collectionslowellobservatory.omeka.net 2 facts
Lumen Learning academic course lumenlearning.com 2 facts
Medievalists.net history media medievalists.net 2 facts
Mental Floss - The Boxing Match That Lasted 7 Hours media mentalfloss.com 2 facts
Mercedes-AMG PETRONAS F1 Team institution mercedesamgf1.com 2 facts
Mercedes-Benz manufacturer heritage archive mercedes-benz-publicarchive.com 2 facts
Microsoft Learn — The History of Microsoft, 1986 Corporate history archive learn.microsoft.com 2 facts
Milestones in U.S. patenting — USPTO government uspto.gov 2 facts
NAACP institution naacp.org 2 facts
National Cancer Institute — SEER Training government training module training.seer.cancer.gov 2 facts
National Library of Ireland national library nli.ie 2 facts
National Library of Scotland national library nls.uk 2 facts
National Museums Liverpool museum liverpoolmuseums.org.uk 2 facts
New Georgia Encyclopedia reference georgiaencyclopedia.org 2 facts
New York State Empire State Plaza government empirestateplaza.ny.gov 2 facts
Nintendo — スーパーマリオブラザーズ (official Famicom software page) manufacturer (official) nintendo.com 2 facts
NOAA Atlantic Oceanographic and Meteorological Laboratory government agency aoml.noaa.gov 2 facts
NOAA National Severe Storms Laboratory — Lightning Basics Government research laboratory nssl.noaa.gov 2 facts
NOAA NESDIS — This Day in History: Mount Tambora Government nesdis.noaa.gov 2 facts
North Carolina Department of Natural and Cultural Resources government dncr.nc.gov 2 facts
Olympedia — 1924 Winter Olympics Overview Olympic history institution olympedia.org 2 facts
Omniglot reference omniglot.com 2 facts
OpenStax (Rice University) peer-reviewed open textbook openstax.org 2 facts
Penn Museum institution penn.museum 2 facts
Penn Today - 9,000-Year History academic penntoday.upenn.edu 2 facts
Perseids Project (Tufts University) Loeb translation of Plutarch, Life of Alexander 3, with editor's note cts.perseids.org 2 facts
Pilgrim Hall Museum museum pilgrimhall.org 2 facts
Plus Magazine (University of Cambridge) University outreach plus.maths.org 2 facts
Pompeii Archaeological Park institution pompeiisites.org 2 facts
Popular Archaeology archaeology magazine article popular-archaeology.com 2 facts
Princeton University Press academic publisher press.princeton.edu 2 facts
Purdue University university engineering blog engineering.purdue.edu 2 facts
Re-Examining the Role of Hydrogen Peroxide in Bacteriostatic and Bactericidal Activities of Honey (Frontiers in Microbiology) journal article frontiersin.org 2 facts
Rock and Roll Hall of Fame and Museum Library — Live Aid 1985 museum library guide rockhall.com 2 facts
Royal Observatory Greenwich Observatory royalobservatorygreenwich.org 2 facts
Royal Observatory of Belgium national observatory oma.be 2 facts
Royal Society of Chemistry institution rsc.org 2 facts
RussianSpaceWeb encyclopedia russianspaceweb.com 2 facts
Securities and Exchange Commission Historical Society — Self-Regulatory Organizations institution sechistorical.org 2 facts
Simply Psychology media simplypsychology.org 2 facts
Sky HISTORY media history.co.uk 2 facts
Smithsonian Libraries institution library.si.edu 2 facts
Smithsonian Libraries and Archives — Darwin's On the Origin of Species Was Published Today, in 1859 national library blog.library.si.edu 2 facts
Smithsonian National Museum of American History institution americanhistory.si.edu 2 facts
South Tyrol Museum of Archaeology Museum iceman.it 2 facts
SPARK Museum of Electrical Invention — The First Transcontinental Telephone museum sparkmuseum.org 2 facts
Stanford Medicine, Institute for Stem Cell Biology and Regenerative Medicine university research institute med.stanford.edu 2 facts
State Library of South Australia state library digital.collections.slsa.sa.gov.au 2 facts
Statue of Liberty–Ellis Island Foundation — Liberty Arrives in NYC Custodial foundation history page statueofliberty.org 2 facts
Suez Canal Authority — Canal History government authority suezcanal.gov.eg 2 facts
Swarthmore College, Global Nonviolent Action Database academic research database nvdatabase.swarthmore.edu 2 facts
Tchaikovsky Research academic reference project tchaikovsky-research.net 2 facts
Tees Valley Museums article teesvalleymuseums.org 2 facts
Television Academy — Leave It to Beaver industry body interviews.televisionacademy.com 2 facts
The birth of the Eiffel Tower — Official Eiffel Tower Website official toureiffel.paris 2 facts
The British Library — Mary Shelley's Frankenstein article britishlibrary.cn 2 facts
The Canadian Encyclopedia (Historica Canada) encyclopedia thecanadianencyclopedia.ca 2 facts
The China Project news outlet thechinaproject.com 2 facts
The first Oktoberfest — Deutschlandmuseum museum deutschlandmuseum.de 2 facts
The Gazette Government record thegazette.co.uk 2 facts
The Kyoto Protocol official organization unfccc.int 2 facts
The Magnus Effect and the FIFA World Cup Match Ball - COMSOL engineering software / technical blog comsol.com 2 facts
The National Gallery (London) museum nationalgallery.org.uk 2 facts
The Nobel Peace Prize (Norwegian Nobel Institute) institution nobelpeaceprize.org 2 facts
The Open University university course material open.edu 2 facts
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Roman Empire (educational reference) Reference article roman-empire.net 0 facts
RTBF public broadcaster history feature rtbf.be 0 facts
Simple Flying: How Boeing Was Founded media simpleflying.com 0 facts
Skeptical Science — The runaway greenhouse effect on Venus explainer skepticalscience.com 0 facts
Southern Adventist University Library — Empires guide academic southern.libguides.com 0 facts
Spain Then and Now history reference site spainthenandnow.com 0 facts
SPIE (International Society for Optics and Photonics) professional society spie.org 0 facts
Stanford Blood Center academic blood center stanfordbloodcenter.org 0 facts
Symmetry magazine of Fermilab and SLAC national laboratories symmetrymagazine.org 0 facts
The British Museum national museum britishmuseum.org 0 facts
The Orwell Foundation Literary foundation / Orwell estate orwellfoundation.com 0 facts
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Thirty-five years later, the Baltic Way still inspires the fight for freedom Atlantic Council analysis atlanticcouncil.org 0 facts
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Turkish Museums Museum feature on the Istanbul Archaeology Museums turkishmuseums.com 0 facts
U.S. Department of Health and Human Services government department hhs.gov 0 facts
United States Golf Association sport governing body usga.org 0 facts
University College London (UCL) University news / research announcement ucl.ac.uk 0 facts
University of Iowa Libraries — New Horizons Reaches Pluto academic library blog.lib.uiowa.edu 0 facts
University of Oregon university pages.uoregon.edu 0 facts
University of Rochester academic pas.rochester.edu 0 facts
USS Hornet Museum — The Space Race / Apollo Splashdown museum uss-hornet.org 0 facts
Vatican Observatory — Galileo: A Quick Summary research institution article vaticanobservatory.org 0 facts
Virginia War Memorial memorial institution vawarmemorial.org 0 facts
We Hack the Moon (Draper) research institute wehackthemoon.com 0 facts
West Virginia Public Broadcasting public media history feature wvpublic.org 0 facts
Western Australian Museum — Skylab model, Esperance Museum museum visitwanderland.com.au 0 facts
Wisconsin Historical Society historical society / primary-source archive americanjourneys.org 0 facts