We’ve talked about different materials engineers use to build things in the world, but there’s a special category of materials they turn to when building things to go inside our bodies. In this episode we’ll explore the world biomaterials like titanium and their coatings, the special chemistry of polyurethane, and the cross-linked structure of hydrogels. We’ll also look at the importance of safety & research, as well as the enormous future potential of biomaterials. Crash Course Engineering is produced in association with PBS Digital Studios:    • All PBS Digital Studios videos   *** RESOURCES: https://www.nibib.nih.gov/science-education/science-topics/biomaterials https://mse.osu.edu/research/biomaterials https://www.nature.com/subjects/biomaterials http://www.medibrane.com/bio-absorbable-implants/ http://pubs.acs.org/cen/coverstory/7906/7906sci2.html https://www.spine-health.com/glossary/biocompatibility https://www.sciencedirect.com/science/article/pii/S2090123213000969 http://www.jbiomeds.com/biomedical-sciences/history-and-applications-of-hydrogels.php?aid=7218 https://link.springer.com/article/10.1007/s10973-016-5329-6 http://fortune.com/2012/09/18/bad-to-the-bone-a-medical-horror-story/ https://ame.nd.edu/research/faculty-research-labs/rroeder/classes/ame-50571/fortunesynthes.pdf http://cornellsun.com/2010/09/21/the-scientist-david-putnam/ https://www.azom.com/article.aspx?ArticleID=1520 https://www.omicsonline.org/scholarly/bio-inert-materials-journals-articles-ppts-list.php https://smartech.gatech.edu/handle/1853/42056 https://link.springer.com/chapter/10.1007/978-0-306-48584-8_7 https://www.sciencedirect.com/science/article/pii/S0945053X14000511 https://www.ncbi.nlm.nih.gov/pubmed/20623672 https://www.ncbi.nlm.nih.gov/pubmed/26894870 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4139820/ http://file.scirp.org/Html/2-1430795_51883.htm *** Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Thanks to the following Patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: Sam Buck, Mark Brouwer, James Hughes, Kenneth F Penttinen, Trevin Beattie, Satya Ridhima Parvathaneni, Erika & Alexa Saur, Glenn Elliott, Justin Zingsheim, Jessica Wode, Eric Prestemon, Kathrin Benoit, Tom Trval, Jason Saslow, Nathan Taylor, Brian Thomas Gossett, Khaled El Shalakany, Indika Siriwardena, SR Foxley, Sam Ferguson, Yasenia Cruz, Eric Koslow, Caleb Weeks, Tim Curwick, D.A. Noe, Shawn Arnold, Malcolm Callis, Advait Shinde, William McGraw, Andrei Krishkevich, Rachel Bright, Mayumi Maeda, Kathy & Tim Philip, Jirat, Ian Dundore -- Want to find Crash Course elsewhere on the internet? Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse Tumblr - http://thecrashcourse.tumblr.com/ Support Crash Course on Patreon: http://patreon.com/crashcourse CC Kids: null