Tracy shares why Bhagat Singh Thind rocketed to the top of her topics list. Holly shares a story of bad cat behavior.

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The Carrington Event was a massive geomagnetic storm that happened in 1859. It led to expanded understanding of solar phenomena.

Research:

• “Great Aurora of 1859. Art. XLII – The Great Auroral Exhibition of August 28th to September 4th, 1859.” American Journal of Science. Ser. 2. Vol. 28. July-November 1859.
• Cardenas, Freddy Moreno et al. “The Grand Aurorae Borealis Seen in Colombia in 1859.” Preprint submitted to Advances in Space Research. August 21, 2015.
• Cliver, E.W. “The 1859 space weather event: Then and now.” Advances in Space Research. 38 (2006) 119-129.
• Cliver, E.W. and L. Svalgaard. “The 1859 Solar-Terrestrial Disturbance and the Current Limits of Extreme Space Weather Activity.” Solar Physics. (2004) 224: 407–422.
• Cliver, Edward W. and William F. Dietrich. “The 1859 space weather event revisited: limits of extreme activity.” J. Space Weather Space Clim. 3 (2013) A31 DOI:10.1051/swsc/2013053
• Dobrijevic, Daisy and Andrew May. “The Carrington Event: History's greatest solar storm.” Space.com. 5/20/2022. https://www.space.com/the-carrington-event
• Giegengack, Robert. “The Carrington Coronal Mass Ejection of 1859.” Proceedings of the American Philosophical Society , DECEMBER 2015, Vol. 159, No. 4. Via JSTOR.https://www.jstor.org/stable/26159195
• Green, James L, and Scott Boardsen. “Duration and extent of the great auroral storm of 1859.” Advances in space research : the official journal of the Committee on Space Research (COSPAR) vol. 38,2 (2006): 130-135. doi:10.1016/j.asr.2005.08.054
• Green, James L. et al. “Eyewitness Reports of the Great Auroral Storm of 1859.” Submitted to Advances in Space Research. NASA Technical Reports Server (NTRS) 20050210157. 8/5/2005.
• Haeberle, Tom. “The Carrington Affair!” Amateur Astronomers Association Eyepiece. 9/1/2018. https://aaa.org/2018/09/01/the-carrington-affair/
• Hayakawa, Hisashi et al. “Temporal and Spatial Evolutions of a Large Sunspot Group and Great Auroral Storms Around the Carrington Event in 1859.” Space Weather. 8/29/2019. https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019SW002269
• Hodgson, R. “On a Curious Appearance Seen in the Sun.” Monthly notices of the Royal Astronomical Society vol. 19-20 (1858-1860). https://academic.oup.com/mnras/article/20/1/15/983497
• Hodžić, Jasna. “The Carrington Event of 1859 Disrupted Telegraph Lines. A ‘Miyake Event’ Would Be Far Worse.” JSTOR Daily. 9/7/2023. https://daily.jstor.org/the-carrington-event-of-1859-disrupted-telegraph-lines/
• Howard, R.A. (2006). A Historical Perspective on Coronal Mass Ejections. In Solar Eruptions and Energetic Particles (eds N. Gopalswamy, R. Mewaldt and J. Torsti). https://doi.org/10.1029/165GM03
• Josefowicz, Diane. “The British Magnetic Scheme (1839-1851): People and Institutions.” Victorian Web. https://victorianweb.org/science/geomagnetism/magneticcrusade.html
• Kaminski, Isabella. “'The fate of nations and the fall of kingdoms': History's epic theories of what causes aurora.” BBC. 11/16/2025. https://www.bbc.com/future/article/20251114-historys-epic-theories-of-what-causes-aurora
• Kimball, D.S. “A Study of the Aurora of 1859.” Scientific Report No. 6. NSF Grant No. Y/22.6/327. April 1960.
• Klein, Christopher. “A Perfect Solar Superstorm: The 1859 Carrington Event.” History. 1/29/2025. https://www.history.com/articles/a-perfect-solar-superstorm-the-1859-carrington-event
• Marinus Anthony van der Sluijs, Hisashi Hayakawa. “A candidate auroral report in the Bamboo Annals, indicating a possible extreme space weather event in the early 10th century BCE.” Advances in Space Research. Volume 72, Issue 12. 2023. https://doi.org/10.1016/j.asr.2022.01.01
• Mills, Virginia. “A message from Alexander von Humboldt.” The Royal Society. 9/23/2019. https://royalsociety.org/blog/2019/09/a-message-from-alexander-von-humboldt/
• Muller, C. “The Carrington solar flares of 1859: consequences on life.” Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life vol. 44,3 (2014): 185-95. doi:10.1007/s11084-014-9368-3
• Phillips, Tony. “A Warning from History: The Carrington Event Was Not Unique.” Space Weather Archive. 9/1/2020. https://spaceweatherarchive.com/2020/08/30/a-warning-from-history-the-carrington-event-was-not-unique/
• Phillips, Tony. “Near Miss: The Solar Superstorm of July 2012.” NASA. 12/22/2014. https://science.nasa.gov/science-research/planetary-science/23jul_superstorm/
• C. Carrington, Description of a Singular Appearance seen in the Sun on September 1, 1859, Monthly Notices of the Royal Astronomical Society, Volume 20, Issue 1, November 1859, Pages 13–15, https://doi.org/10.1093/mnras/20.1.13
• Starmans, Barbara J. “Carrington Solar Flare of 1859.” The Social Historian. 11/27/2016. https://www.thesocialhistorian.com/carrington-solar-flare-of-1859/
• Thompson, D. (2009) The Carrington Event and the Electric Telegraph in Victoria in Museums Victoria Collections https://collections.museumsvictoria.com.au/articles/2880

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United States v. Bhagat Singh Thind was a 1923 case that hinged on what it meant to be white.

Research:

• “Ozawa v. United States, 260 U.S. 178 (1922).” https://supreme.justia.com/cases/federal/us/260/178/
• “United States v. Bhagat Singh Thind, 261 U.S. 204 (1923).” https://supreme.justia.com/cases/federal/us/261/204/
• de la Garza, Amanda. “Doctorji: The Life. Teachings, and Legacy of Dr. Bhagat Singh Thind.” David Bhagat Thind. 2010.
• Deslippe, Philip. “Bhagat Singh Thind in Jail.” SAADA. https://www.saada.org/tides/article/bhagat-singh-thind-in-jail
• Deslippe, Philip. “Doctorji the Divorcé: Understanding Bhagat Singh Thind Through His Marriage to Inez Buelen.” Ethnic Studies Review 1 July 2023; 46 (1-2): 52–68. doi: https://doi.org/10.1525/esr.2023.46.1-2.52
• Kanwar, Joy. “Stories from the Negative Spaces: United States v. Thind and the Narrative of (Non)Whiteness.” Mercer Law Review. Vol. 74, No. 3. 2023. https://digitalcommons.law.mercer.edu/cgi/viewcontent.cgi?article=3111&context=jour_mlr
• Munshi, Sherally. “Remembering Thind.” Ethnic Studies Review, Vol. 46, Issue 1-2, pp. 98–116. DOI: https://doi.org/10.1525/esr.2023.46.1-2.98
• Ogden, Johanna. “The Telling Case of Doctor Bhagat Singh Thind.” Oregon Historical Quarterly. Vol. 124, No. 1. 2023. https://www.ohs.org/oregon-historical-quarterly/back-issues/upload/Ogden_Baghat-Singh-Thind_OHQ-124_1_Spring-2023_web.pdf
• “Bhagat Singh Thind.” Roots in the Sand. 2000. https://www.pbs.org/rootsinthesand/i_bhagat1.html
• Pillai, Daksha. “United States v. Bhagat Singh Thind: Dual Legacies of a Forgotten Supreme Court Case.” Gilder Lehrman Institute of American History. https://www.gilderlehrman.org/sites/default/files/file_media/38_Pillai.pdf
• Qin, Amy. “In the Birthright Citizenship Hearing, a Story of Asians Fighting for Rights.” New York Times. 4/2/2026. https://www.nytimes.com/2026/04/02/us/politics/birthright-citizenship-asian-immigrants.html
• Shankar, Arjun. “On Brown Blood Race, Caste, and the Bhagat Singh Thind Case.” Ethnic Studies Review, Vol. 46, Issue 1-2, pp. 135–155. DOI: https://doi.org/10.1525/esr.2023.46.1-2.135
• Smith, Marian L. “Race, Nationality, and Reality: INS Administration of Racial Provisions in U.S. Immigration and Nationality Law Since 1898.” Prologue. Vol. 34, No. 2. Summer 2002. https://www.archives.gov/publications/prologue/2002/summer/immigration-law-1
• South Asian American Digital Archive. “The Problem.” https://www.saada.org/explore/exhibits/theproblem
• Supreme Court of the United States. “Donald J. Trump, president of the United States et al., petitioners, v. Barbara et al, Respondents.” No. 25-365. Oral arguments. Heritage Reporting Corporation. April 1, 2026. https://www.supremecourt.gov/oral_arguments/argument_transcripts/2025/25-365_l6gn.pdf
• The Pluralism Project. “The Ghadar Party: Freedom for India.” Harvard University. https://pluralism.org/the-ghadar-party-freedom-for-india

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This 2023 episode covers the Insular Cases, which are SCOTUS cases regarding rights of people in U.S. territories. 

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Holly talks about how small the circle of London intellectuals was in John Graunt's time. Then there is discussion of disco balls in bathrooms.

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There are so many things in our modern world that we presume are fairly recent inventions. But the three things we’re going to talk about in this instance are quite old, but they have close associations with the recent past.

Research:

• Abbott, David, PhD., ed. “The Biographical Book of Scientists: Engineers and Inventors.” Peter Bedrick Books. New York. 1985.
• “Bad Breath.” Medline Plus. https://medlineplus.gov/badbreath.html#:~:text=Teenagers-,Summary,help%20give%20you%20fresher%20breath.
• Berlin, Erika. “‘The Myriad Reflector’: The Early, Forgotten Disco Ball.” Mental Floss. May 21, 2015. https://www.mentalfloss.com/entertainment/myriad-reflector-early-forgotten-disco-ball
• Britannica Editors. "aeolipile". Encyclopedia Britannica, 6 Jun. 2016, https://www.britannica.com/technology/aeolipile
• Britannica Editors. "Heron of Alexandria". Encyclopedia Britannica, 12 Mar. 2024, https://www.britannica.com/biography/Heron-of-Alexandria
• Garber, David. “Meet Me Under the Disco Ball: A History of Nightlife’s Most Enduring Symbol.” Vice. June 4, 2015. https://www.vice.com/en/article/meet-me-under-the-disco-ball-a-history-of-nightlifes-most-enduring-symbol/
• Handwerk, Brian. “The History and Science Behind Your Terrible Breath.” Smithsonian. Feb. 13, 2017. https://www.smithsonianmag.com/science-nature/halitosis-horrors-how-bad-breath-became-americas-worst-nightmare-180962104/
• HØYRUP, JENS. “A NEW EDITION OF THE METRICA OF HERON OF ALEXANDRIA.” Physis. Vol. LIII. 2018. http://akira.ruc.dk/~jensh/Publications/2018%7BR%7D06_A%20New%20Edition%20of%20the%20Metrica%20of%20Heron%20of%20Alexandria_S.pdf
• Hughes, J. Donald. “Hero of Alexandria.” Ebsco. 2023. https://www.ebsco.com/research-starters/biography/hero-alexandria
• Mendell, H. “Hero and the tradition of the circle segment.” Arch. Hist. Exact Sci. 77, 451–499 (2023). https://doi.org/10.1007/s00407-023-00308-y
• “Mint! From the Ancient World to Modern Manchester.” Manchester Museum. Aug. 17, 2018. https://storiesfromthemuseumfloor.wordpress.com/2018/08/17/mint-from-the-ancient-world-to-modern-manchester/#:~:text=The%20ancient%20Egyptians%20invented%20breath%20mints%20to,*%20Severely%20worn%20teeth%20*%20Tooth%20loss
• “Myriad Reflector Will Feature Annual Fall Opening Odeon Ball.” Great Falls leader. Sept. 4, 1921. https://www.newspapers.com/image/1018804435/?match=1&terms=%22myriad%20reflector%22
• “Plant of the Month: Mint.” JSTOR Daily. https://daily.jstor.org/plant-of-the-month-mint/
• Pliny the Elder. “The Natural History.” Translated by John Bostock and Henry T. Riley. Taylor & Francis. London. 1855. Project Gutenberg. https://www.gutenberg.org/ebooks/author/50041
• Rossen, Jake. “All That Glitters: A History of the Disco Ball.” Mental Floss. Dec. 30, 2021. https://www.mentalfloss.com/entertainment/music/disco-ball-facts-history
• “Saltair.” Salt Lake Telegram. June 13, 1921. https://www.newspapers.com/image/288643722/?match=1&terms=%22myriad%20reflector%22
• Smith, Grafton Elliot, et al. “The Papyrus Ebers.” Ares Publishers. Chicago. 1974. https://babel.hathitrust.org/cgi/pt?id=coo.31924073200077&seq=5
• “Strike the Banners.” The Kentucky Post. August 31, 1945. https://www.newspapers.com/image/760821309/?match=1&terms=%22L.%20B.Woeste%22
• “Wonderful Falls Short of Expressing the Grandeur of the Rotary Charity Ball.” The Piqua Daily Call. Jan. 26, 1917. https://www.newspapers.com/image/935844964/?match=1&terms=%22myriad%20reflector%22
• Woeste, L.B. “Myriad Reflector.” U.S. Patent Office. Feb. 6, 1917. https://patentimages.storage.googleapis.com/9e/4c/73/00bfc626d3f664/US1214863.pdf
• Woeste, L.B. “Myriad Reflector.” U.S. Patent Office. March 13, 1928. https://ppubs.uspto.gov/api/pdf/downloadPdf/1662554?requestToken=eyJzdWIiOiIyM2QyOTAxNi1iNjVhLTRkNTAtYWEyOS0zZjAyOWMwYmZiMWUiLCJ2ZXIiOiJmZjg4ZmU5Yy1iOTA2LTQxZDUtYTQxMS02MGM5Mzk3NTk0YzYiLCJleHAiOjB9
• “Woeste Rites Are Set.” Cincinatti Enquirer. April 11, 1933. https://www.newspapers.com/image/103141821/?article=7dc922a9-f0a9-42b8-a61e-f9e92a7b3557&terms=%22Louis%20B.%20Woeste%22
• Woodcroft, Bennet, ed. “The Pneumatics of Hero of Alexandria.” Taylor Walton and Maberly. London. 1851. Accessed online: https://www.thehopkinthomasproject.com/TheHopkinThomasProject/TimeLine/Wales/Steam/URochesterCollection/Hero/index-2.html

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John Graunt was a shopkeeper in 17th-century London who followed his own curiosity to a rather grand result. His work gave rise to the fields of demography and epidemiology.

Research:

• Berke, Olaf, et al. “Celebration day: 400th birthday of John Graunt, citizen scientist of London.” Environmental Health Review. 63(3): 67-69. 2020. https://doi.org/10.5864/d2020-018
• Britannica Editors. "John Graunt". Encyclopedia Britannica, 20 Apr. 2025, https://www.britannica.com/biography/John-Graunt
• Britannica, The Editors of Encyclopaedia. "Sir William Petty." Encyclopedia Britannica, 11 Apr. 2026, https://www.britannica.com/money/William-Petty
• Clark, Andrew. “Aubrey’s ‘Brief Lives.’” Oxford. Clarendon Press. 1898. https://dn790003.ca.archive.org/0/items/briefliveschiefl01aubruoft/briefliveschiefl01aubruoft.pdf
• Connor, Henry. “John Graunt F.R.S. (1620-74): The founding father of human demography, epidemiology and vital statistics.” Journal of medical biography 32,1 (2024): 57-69. doi:10.1177/09677720221079826
• Eschner, Kat. “People Have Been Using Big Data Since the 1600s.” Smithsonian. April 24, 2017. https://www.smithsonianmag.com/smart-news/people-have-been-using-big-data-1600s-180962949/
• Glass, D.V., et al. “John Graunt and His Natural and Political Observations [and Discussion].” Proceedings of the Royal Society of London. Series B, Biological Sciences, Vol. 159, No. 974, A Discussion on Demography (Dec. 10, 1963), pp. 2-37 Published by: The Royal Society Stable URL: https://www.jstor.org/stable/90480
• Graunt, John. “Natural and political observations mentioned in a following index, and made upon the Bills of mortality.” Oxford : Printed by William Hall, for John Martyn, and James Allestry, printers to the Royal Society MDCLXV [1665]. http://resource.nlm.nih.gov/2356017R
• KARGON, ROBERT. “John Graunt, Francis Bacon, and the Royal Society: The Reception of Statistics.” Journal of the History of Medicine and Allied Sciences, vol. 18, no. 4, 1963, pp. 337–48. JSTOR, http://www.jstor.org/stable/24621352
• Kelsey, Holly. “Sovereign and the Sick City in 1603.” Shakespeare Birthplace Trust. Aug. 23, 2016. https://www.shakespeare.org.uk/explore-shakespeare/blogs/sovereign-and-sick-city-1603/
• Lewin, C. G. "Graunt, John (1620–1674), statistician." Oxford Dictionary of National Biography.  August 08, 2024. Oxford University Press. https://www.oxforddnb.com/view/10.1093/ref:odnb/9780198614128.001.0001/odnb-9780198614128-e-11306
• Pepys, Samuel. “The Diary of Samuel Pepys.” GEORGE BELL & SONS. London. 1893. Accessed online: https://www.gutenberg.org/cache/epub/4200/pg4200.txt
• Smith, R.M. (2008). “Graunt, John (1620–1674).” The New Palgrave Dictionary of Economics. Palgrave Macmillan, London. https://doi.org/10.1057/978-1-349-95121-5_758-2

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This 2019 episode marked 100 years since a wave of racist violence in the U.S. that became known as Red Summer. In many ways, Red Summer was a response to (but NOT caused by) two earlier events: the Great Migration and the return of black soldiers who had fought in World War I.

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Holly and Tracy commiserate about sending greeting cards. Tracy talks about how she shifted away from an episode exclusively about Frances Thompson.

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The Memphis Massacre was a truly horrific wave of destruction and violence, including sexual violence, against the Black community of Memphis just a year after the end of the U.S. Civil War.

Research:

• “Memphis Daily Appeal Interviews Frances Thompson (1876),” SHEC: Resources for Teachers, accessed April 9, 2026, https://shec.ashp.cuny.edu/items/show/3717.
• “The Outrage Mill.” The North Missouri Register. 9/14/1876.
• “The Reports of the Committees of the House of Representatives Made during the First Session Thirty-ninth Congress, 1865-’66.” Washington: Government Printing Office. https://www.govinfo.gov/app/details/SERIALSET-01274_00_00-002-0101-0000/context
• Blank, Christopher. “Do The Words 'Race Riot' Belong On A Historic Marker In Memphis?” Code Switch. NPR. 5/2/2016. https://www.npr.org/sections/codeswitch/2016/05/02/476450908/in-memphis-a-divide-over-how-to-remember-a-massacre-150-years-later
• Britannica Editors. "Memphis massacre of 1866". Encyclopedia Britannica, 15 Feb. 2024, https://www.britannica.com/event/Memphis-Race-Riot. Accessed 8 April 2026.
• Carriere, Marius. “An Irresponsible Press: Memphis Newspapers and the 1866 Riot.” Tennessee Historical Quarterly , Spring 2001, Vol. 60, No. 1. https://www.jstor.org/stable/42628498
• Davis, Justin A. “How a disabled Black trans woman left her mark on 19th-century Memphis.” The Emancipator. 6/13/2024. https://theemancipator.org/2024/06/13/topics/histories/how-a-disabled-black-trans-woman-left-her-mark-on-19th-century-memphis/
• Donald, Bernice Bouie. “When the Rule of Law Breaks Down: Implications of the 1866 Memphis Massacre for the Passage of the Fourteenth Amendment.” Boston Law Review. Vol. 98. 2018.
• Equal Justice Institute. “On this day - Apr 30, 1866: White Police and Mobs Terrorize and Kill Black Residents in Memphis.” https://calendar.eji.org/racial-injustice/apr/30
• Harper’s Weekly. “The Memphis Riots.” 5/26/1866.
• Johnson, Charles F. and T.W. Gilbreth. “The Freedmen’s Bureau Report on the Memphis Race Riots of 1866.” 5/22/1866. https://teachingamericanhistory.org/document/the-freedmens-bureau-report-on-the-memphis-race-riots-of-1866/
• Kimberley, Lewis. “’If you kill him, you have got to kill me first’: examining individual and collective loyalties during the Memphis Massacre (1866).” American Nineteenth Century History. Vol. 25, 2024. https://www.tandfonline.com/doi/full/10.1080/14664658.2024.2316465
• O’Donovan, Susan and Beverly Bond. “ ‘A History They Can Use’: The Memphis Massacre and Reconstruction’s Public History Terrain.” The Journal of the Civil War Era. 8/15/2016. https://www.journalofthecivilwarera.org/2016/08/history-can-use-memphis-massacre-reconstructions-public-history-terrain/
• Stryker, Susan. “To Appear As We Please.” Aperture, Winter 2017, No. 229, Future Gender. Via JSTOR. https://www.jstor.org/stable/44898154
• Walker, Barrington. “'This is the White Man's Day': The Irish, White Racial Identity, and the 1866 Memphis Riots.” Left History. Vol. 5, No. 2, 1997. https://doi.org/10.25071/1913-9632.5336

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Humans have been exchanging tokens of friendship since before recorded history. From calling cards to Valentines to Christmas cards, the modern greeting card industry evolved.

Research:

• “America’s First Christmas Card.” Albany Institute of History and Art. https://www.albanyinstitute.org/online-exhibition/50-objects/section/america-s-first-christmas-card
• Britannica Editors. "scarab". Encyclopedia Britannica, 3 Apr. 2014, https://www.britannica.com/topic/scarab
• Britannica Editors. "greeting card". Encyclopedia Britannica, 15 Mar. 2024, https://www.britannica.com/topic/greeting-card
• Brown, Ellen F. “Christmas, Inc.: A Brief History of the Holiday Card.” JSTOR Daily. Dec. 20, 2015. https://daily.jstor.org/history-christmas-card-holiday-card/
• Chase, Ernest Dudley. “The Romance of Greeting Cards.” Rust Craft. Cambridge, MA. 1956.
• “Dali at Hallmark.” Hallmark Art Collection. https://www.hallmarkartcollection.com/creatively-thinking/stories/dali-at-hallmark/
• “Esther Howland 1847.” Mount Holyoke. https://www.mtholyoke.edu/directory/alum/esther-howland
• Evans, Elaine Altman. “The Sacred Scarab, Occasional Paper.” McClung Museum of Natural History and Culture. University of Tennessee. January 1, 1996. https://mcclungmuseum.utk.edu/1996/01/01/sacred-scarab/
• Greeting Card Association. “The History of Greeting Cards.” https://www.greetingcard.org/history/
• Hanc, John. “The History of the Christmas Card.” Smithsonian. Dec. 9, 2015. https://www.smithsonianmag.com/history/history-christmas-card-180957487/
• Henry, William E. “Art and Cultural Symbolism: A Psychological Study of Greeting Cards.” The Journal of Aesthetics and Art Criticism, vol. 6, no. 1, 1947, pp. 36–44. JSTOR, https://doi.org/10.2307/426176
• Kavanagh, Marybeth. “Louis Prang, Father of the American Christmas Card.” The New York Historical. Dec. 19, 2012. https://www.nyhistory.org/blogs/prang
• Koon, Wee Kek. “How ancient Chinese new year cards went from elites’ greetings to bribery instruments.” South China Morning Post. Jan. 31, 2026. https://www.scmp.com/lifestyle/chinese-culture/article/3341675/how-ancient-chinese-new-year-cards-went-elites-greetings-bribery-instruments?module=perpetual_scroll_0&pgtype=article
• Korolkov, Maxim. “‘Greeting Tablets’ in Early China: Some Traits of the Communicative Etiquette of Officialdom in Light of Newly Excavated Inscriptions.” T’oung Pao, vol. 98, no. 4/5, 2012, pp. 295–348. JSTOR, http://www.jstor.org/stable/41725988
• Lee, Ruth Webb. “A History of Valentines.” 1984.
• Newberry, Percy E. “Scarabs: An Introduction to the Study of Egyptian Seals and Signet Rings.” London. Archibald Constable and Co. Ltd. 1908. https://dn790001.ca.archive.org/0/items/scarabsintroduc00newbuoft/scarabsintroduc00newbuoft.pdf
• Purcell, Denise. “Authentic Messaging and Independent Makers Drive Greeting Cards' Next-Gen Relevance.” U.S. Chamber of Commerce. https://www.uschamber.com/co/good-company/launch-pad/greeting-card-next-gen-relevance#:~:text=The%20category%20is%20massive:%20According,card%20market%20at%20$7%20billion.
• Grafton, Samuel. “Holly Leaf and Copper Plate.” The North American Review, vol. 226, no. 6, 1928, pp. 660–64. JSTOR, http://www.jstor.org/stable/25110633
• Shoichet, Catherine E. “This ‘visionary’ woman changed the way many Americans celebrate Valentine’s Day.” CNN. Feb. 14, 2024. https://edition.cnn.com/2024/02/13/style/esther-howland-valentines-card-history-cec
• Schmidt, Leigh Eric. “The Commercialization of the Calendar: American Holidays and the Culture of Consumption, 1870-1930.” The Journal of American History, vol. 78, no. 3, 1991, pp. 887–916. JSTOR, https://doi.org/10.2307/2078795
• Stupperich, Andy. “Art Education: Louis Prang's Christmas Card Competitions.” The Henry Ford Museum. January 29, 2026. https://www.thehenryford.org/collections/explore/articles/art-education-louis-prang%27s-christmas-card-competitions
• Terrell, Ellen. “Esther Howland and the Business of Love.” Library of Congress. March 23, 2016. https://blogs.loc.gov/inside_adams/2016/03/esther-howland-and-the-business-of-love/
• “World's first printed Valentine's Card.” A History of the World. BBC. 2014. https://www.bbc.co.uk/ahistoryoftheworld/objects/L1NM_6mWRymAMKXcRDlXJA
• Wright, Helena E. “A winning design: Prang’s Christmas card contests of the 1880s.” National Museum of American History. December 23, 2019. https://americanhistory.si.edu/explore/stories/winning-design-prangs-christmas-card-contests-1880s

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