Scientists have been trying to pull blood out of the body and put it back in again since the early 1800s, but bypass machines haven't been easy to get right. Hosted by: Michael Aranda ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطا الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- 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: books.google.com/books?id=UPUCDAAAQBAJ&lpg=PA119&dq=vitreous%20fluid%20center%20gel%20edges&pg=PA119#v=onepage&q&f=false thesis.library.caltech.edu/974/3/CSN_CH3.pdf www.sciencedirect.com/topics/veterinary-science-and-veterinary-medicine/vitreous-humour www.jci.org/articles/view/10706/pdf nei.nih.gov/health/floaters/floaters www.healthline.com/human-body-maps/eye-vitreous-and-aqueous-humor#seoBlock www.aclm.org.uk/index.php?url=04_FAQs/default.php&Q=3 www.healthline.com/human-body-maps/cornea Images: commons.wikimedia.org/wiki/File:Eye-diagram_bg.svg commons.wikimedia.org/wiki/File:FundusPhotoAntha.jpg

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