Editing Louisiana Purchase Exposition (section)

===Medical contributions===
'''Finsen light''' – The Finsen light, invented by [[Niels Ryberg Finsen]], treated [[tuberculosis luposa]]. Finsen received the Nobel Prize in Medicine and Physiology in 1903.<ref name=":4" /> This pioneered [[phototherapy]].<ref name=":4">{{Cite web|url=http://www.faqs.org/health/topics/79/Finsen-light.html|title=Finsen Light|website=faq.org|publisher=Advameg, Inc.|access-date=November 13, 2016|url-status=dead|archive-url=https://web.archive.org/web/20161115135946/http://www.faqs.org/health/topics/79/Finsen-light.html|archive-date=November 15, 2016}}</ref>

'''X-ray machine''' – The [[X-ray generator|X-ray machine]] was launched at the 1904 World's Fair. German scientist [[Wilhelm Röntgen|Wilhelm Conrad Röntgen]] discovered X-rays studying electrification of low pressure gas.<ref>{{Cite web|url=https://www.nobelprize.org/nobel_prizes/physics/laureates/1901/rontgen-bio.html|title=Wilhelm Conrad Röntgen – Biographical|date=2014|website=Nobelprize.org|publisher=Nobel Media AB|access-date=November 13, 2016|url-status=live|archive-url=https://web.archive.org/web/20161120234908/http://www.nobelprize.org/nobel_prizes/physics/laureates/1901/rontgen-bio.html|archive-date=November 20, 2016}}</ref> He X-rayed his wife's hand, capturing her bones and wedding ring to show colleagues. [[Thomas Edison]] and assistant [[Clarence Madison Dally|Clarence Dally]] recreated the machine. Dally failed to test another X-ray machine at the 1901 World's Fair after [[Assassination of William McKinley|President McKinley was assassinated]].<ref>{{Cite web|url=http://www.smithsonianmag.com/ist/?next=/history/clarence-dally-the-man-who-gave-thomas-edison-x-ray-vision-123713565/|archive-url=https://web.archive.org/web/20150818192816/http://www.smithsonianmag.com/ist/?next=%2Fhistory%2Fclarence-dally-the-man-who-gave-thomas-edison-x-ray-vision-123713565%2F|url-status=dead|archive-date=August 18, 2015|title=Clarence Dally — The Man Who Gave Thomas Edison X-Ray Vision|last=King|first=Gilbert|date=March 14, 2012|website=smithsonianmag.com|access-date=November 13, 2016}}</ref> A perfected X-ray machine was successfully exhibited at the 1904 World's Fair. X-rays are now commonplace in hospitals and airports.<ref name=":3" />

'''Infant incubator''' – Although [[Neonatal intensive care unit#Incubator|infant incubators]] were invented in the year 1888 by Drs. Alan M. Thomas and William Champion, adoption was not immediate. To advertise the benefits, incubators containing preterm babies were displayed at the [[Brussels International Exposition (1897)|1897]], [[Trans-Mississippi Exposition|1898]], [[Pan-American Exposition|1901]], and 1904 World Fairs.<ref>{{Cite news|title=Incubator Graduates|date=August 6, 1904|publisher=Harper & Brothers|newspaper=Harper's Weekly|editor-last=Harvey|editor-first=George|location=New York|page=1225|via=harpweek.com}}</ref> These provided immunocompromised neonates a sanitary environment. Each incubator comprised an airtight glass box with a metal frame. Hot forced air thermoregulated the container. Newspapers advertised the incubators with "lives are being preserved by this wonderful method."<ref name=":2">{{Cite web|url=http://atthefair.homestead.com/pkeatt/Babyincubators.html|title=Baby Incubators|last=Gaskins|first=Lee|date=2008|website=At The Fair: The 1904 St Louis World Fair|access-date=November 13, 2016|url-status=dead|archive-url=https://web.archive.org/web/20170510101238/http://atthefair.homestead.com/pkeatt/Babyincubators.html|archive-date=May 10, 2017}}</ref> During the 1904 World Fair, E. M. Bayliss exhibited these devices on The Pike where approximately ten nurses cared for twenty-four neonates.<ref name=":3">{{Cite web|url=https://source.wustl.edu/2004/04/xrays-fax-machines-and-ice-cream-cones-debut-at-1904-world-fair/|title=X-rays, 'fax machines' and ice cream cones debut at 1904 World's Fair|last=Lutz|first=Diana|date=April 7, 2004|website=Washington University in St. Louis: the Source|url-status=dead|archive-url=https://web.archive.org/web/20161115134317/https://source.wustl.edu/2004/04/xrays-fax-machines-and-ice-cream-cones-debut-at-1904-world-fair/|archive-date=November 15, 2016|access-date=November 15, 2016}}</ref><ref name=":2" /> The entrance fee was 25 cents ({{inflation|US|0.25|1904|r=2|fmt=eq}}){{inflation/fn|US}} while the adjoining shop and café offered souvenirs and refreshments. Proceeds totaling $181,632 (equivalent to ${{formatprice|{{inflation|US|181632|1904}}}} in {{inflation/year|US}}){{inflation/fn|US}} helped fund Bayliss's project.<ref name=":3" /> Inconsistent sanitation killed some babies, so glass walls were installed between them and visitors, shielding the infants.<ref>{{Cite web|url=http://webpages.charter.net/mtruax/1904wf/home.html|title=Infant Incubators|last=Truax|first=Mike|date=October 2009|website=Mike's 1904 St. Louis World's Fair|access-date=November 13, 2016|url-status=dead|archive-url=https://web.archive.org/web/20160824131950/http://webpages.charter.net/mtruax/1904wf/home.html|archive-date=August 24, 2016}}</ref>{{Fv|date=July 2024}} These developed into "isolettes" in modern [[Neonatal intensive care unit#Equipment|neonatal intensive care units]].