Throughout history, people have been trying to figure out how our bodies work and how to fix them when things go wrong. This has led to some ideas that, with the benefit of hindsight, seem very strange. Hosted by: Hank Green Head to scishowfinds.com/ for hand selected artifacts of the universe! ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Lazarus G, Sam Lutfi, D.A. Noe, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, Tim Curwick, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: www.nlm.nih.gov/exhibition/shakespeare/fourhumors.html www.jstor.org/stable/10.1163/j.ctt1w76vxr.21?seq=26#page_scan_tab_contents www.britannica.com/science/humor-ancient-physiology www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0251%3Atext%3Dintro%3Achapter%3D9 web.archive.org/web/20110708073035/http://www.bloodmed.com/home/hannpdf/bjh3130.pdf ocp.hul.harvard.edu/contagion/humoraltheory.html ore.exeter.ac.uk/repository/bitstream/handle/10871/9021/Keith%20Stewart%20Presentation%20for%20Humanities%20PGR%20Conference%20April%20and%20May%202013.pdf;sequence=3 www.smithsonianmag.com/history/how-coffee-chocolate-and-tea-overturned-1500-year-old-medical-mindset-180963339/ academic.oup.com/labmed/article-abstract/14/12/791/2642842?redirectedFrom=PDF www.amjmedsci.com/article/S0002-9629(15)30578-4/pdf www.carlsterner.com/research/files/History_of_Miasmic_Theory_2007.pdf broughttolife.sciencemuseum.org.uk/broughttolife/techniques/miasmatheory www.ph.ucla.edu/epi/snow/choleratheories.html www.infezmed.it/media/journal/Vol_20_1_2012_9.pdf www.newswise.com/articles/view/554637/ www.colgate.com/en-us/oral-health/conditions/cavities/tooth-worm-0716 web.archive.org/web/20170427202326/http://thechirurgeonsapprentice.com/2014/01/06/the-battle-of-the-tooth-worm/ link.springer.com/article/10.1007/s007840050070#page-1 arthistoryresources.net/visual-experience-2014/extramission-intromission.html web.stanford.edu/class/history13/earlysciencelab/body/eyespages/eye.html www.spring.org.uk/2008/03/50-of-college-students-think-we-see.php www.ncbi.nlm.nih.gov/pubmed/12094435 www.muslimheritage.com/article/ibn-al-haytham-eye-and-brain-vision-and-perception neuroportraits.eu/portrait/felix-platter www.britannica.com/science/light#ref258388 www.aaojournal.org/article/S0161-6420(15)01431-1/pdf www.researchgate.net/publication/247752397_The_Fire_That_Comes_from_the_Eye embryo.asu.edu/pages/ernst-haeckels-biogenetic-law-1866 embryo.asu.edu/pages/meckel-serres-conception-recapitulation embryo.asu.edu/pages/ernst-heinrich-philipp-august-haeckel-1834-1919

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