The Disease That Struck Medieval Church Organs

During long, cold winters in medieval Europe, church organs grew gray, sickly-looking circles that spread over their pipes. People back then believed that this was the work of the devil, but as it turns out, it’s just some pretty simple chemistry. SciShow is supported by . Go to to get 20% off of an annual Premium subscription. Hosted by: Stefan Chin SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at ---------- Support SciShow by becoming a patron on Patreon: ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Kevin Carpentier, Eric Jensen, Matt Curls, Sam Buck, Christopher R Boucher, Avi Yashchin, Adam Brainard, Greg, Alex Hackman, Sam Lutfi, D.A. Noe, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- Looking for SciShow elsewhere on the internet? Facebook: Twitter: Tumblr: Instagram: ---------- Sources: Image Sources: pest&title=Special:Search&profile=advanced&fulltext=1&advancedSearch-current={}&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File: #/media/File: #/media/File: :// pest&title=Special:Search&profile=advanced&fulltext=1&advancedSearch-current={}&ns0=1&ns6=1&ns12=1&ns14=1&ns100=1&ns106=1#/media/File: