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A cure for leprosy eluded humans for thousands of years, until the pioneering chemistry work of Alice Ball. With her treatment, patients recovered enough to be discharged from the hospital by the hundreds.

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2682583/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC444418/
https://www.researchgate.net/profile/John_Parascandola/publication/277597573_Chaulmoogra_Oil_and_the_Treatment_of_Leprosy/links/58eb9e430f7e9b6b274b9200/Chaulmoogra-Oil-and-the-Treatment-of-Leprosy.pdf
https://www.nationalgeographic.com/news/2018/02/alice-ball-leprosy-hansens-disease-hawaii-womens-history-science/
https://www.uhfoundation.org/impact/students/woman-who-changed-world
https://www.thoughtco.com/definition-of-saponification-605959
https://www.chemistryworld.com/culture/alice-balls-treatment-for-leprosy/4011313.article?adredir=1
https://www.chemguide.co.uk/organicprops/esters/background.html
https://zenodo.org/record/1496183#.X7Y2QWhKiUm
http://www.northwesthawaiitimes.com/hnsept07.htm
https://books.google.de/books?id=uomdpaHWaC0C&pg=PA178&lpg=PA178&dq=alice+augusta+ball&redir_esc=y&hl=de#v=onepage&q=alice%20ball&f=false
https://www.hawaii.edu/offices/bor/distinction.php?person=ball
https://www.imdb.com/title/tt10318550/

Images:
https://en.wikipedia.org/wiki/File:Leprosorium.jpg
https://commons.wikimedia.org/wiki/File:M_leprae_ziehl_nielsen2.jpg
https://en.wikipedia.org/wiki/File:Alicia_Augusta_Ball.jpg
https://commons.wikimedia.org/wiki/File:James_Presley_Ball_(1825-1904)_from_Willis_1993_from_Mumford_1980.jpg
https://commons.wikimedia.org/wiki/File:Colleges_and_Universities_-_Cornell_University_-_one_of_the_dark_rooms_-_NARA_-_26425820.jpg
https://en.wikipedia.org/wiki/File:Image-Hydnocarpus_annamensis_Flacourtiaceae.JPG
https://commons.wikimedia.org/wiki/File:Chaulmoogra_oil_factory_of_Prasana_Kumar_Sen,_Chittagong._Ph_Wellcome_V0027698.jpg
https://en.wikipedia.org/wiki/File:Pouring_lye_into_water_to_make_soap.jpg
https://en.wikipedia.org/wiki/File:Dr_Isabel_Kerr_European_missionary_vaccinating_a_child_Wellcome_L0069838.jpg
https://commons.wikimedia.org/wiki/File:Marotti.jpg