We talk a lot about CRISPR and "designer babies" but the science of editing genes is varied and complex. This month, an adult man received billions of gene-editing viruses via an IV in an effort to treat a rare disease. For SciShow Finds: scishowfinds.com/ We're conducting a survey of our viewers! If you have time, please give us feedback: www.surveymonkey.com/r/SciShowSurvey2017 Hosted by: ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: KSam Lutfi, Kevin Knupp, Nicholas Smith, Inerri, D.A. Noe, alexander wadsworth, سلطان الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, 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, Fatima Iqbal, 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: apnews.com/4ae98919b52e43d8a8960e0e260feb0a/AP-Exclusive:-US-scientists-try-1st-gene-editing-in-the-body www.nature.com/news/crispr-gene-editing-tested-in-a-person-for-the-first-time-1.20988 ghr.nlm.nih.gov/condition/mucopolysaccharidosis-type-ii www.sciencemag.org/news/2017/11/human-has-been-injected-gene-editing-tools-cure-his-disabling-disease-here-s-what-you www.wired.com/2013/08/the-fall-and-rise-of-gene-therapy-2/ www.nbcnews.com/id/20730647/ns/health-health_care/t/womans-death-calls-gene-therapy-question/ learn.genetics.utah.edu/content/genetherapy/challenges/ www.ncbi.nlm.nih.gov/pmc/articles/PMC3176093/ www.the-scientist.com/?articles.view/articleNo/49456/title/First-In-Vivo-Human-Genome-Editing-to-Be-Tested-in-New-Clinical-Trial/ academic.oup.com/nar/article/33/18/5978/2401349 Images en.wikipedia.org/wiki/Zinc_finger_nuclease#/media/File:Repair_outcomes_of_a_genomic_double-strand_break_for_ZFN_cleavage.jpg commons.wikimedia.org/wiki/File:Human_chromosome_X_from_Gene_Gateway_-_no_label.png thinkstock.com