Computers use error-correcting codes to detect mistakes in binary notations - even just a single change from 0 to 1. In this clip from the 2006 CHRISTMAS LECTURES "The num8er my5teries", Marcus du Sautoy runs error-correcting code tests with an audience member and explains how the mathematics is used in CDs and satellite communications. Subscribe for regular science videos: http://bit.ly/RiSubscRibe This video is from our 2017 advent calendar. Watch the full series here: https://www.youtube.com/playlist?list=PLbnrZHfNEDZyvS5Cx-aRTX-Y8IBJCNmYm Or watch the full lecture here: http://www.rigb.org/christmas-lectures/watch/2006/the-num8er-my5teries/lecture-4?utm_source=youtube&utm_medium=social&utm_campaign=2017_advent&utm_content=description The Royal Institution 2017 advent calendar ‘Transmissions Through Time’ looks through the lens of CHRISTMAS LECTURES past to share the best demonstrations around the science of communication. From Attenborough and Sagan to Woollard and Fong, we revisit old favourites and find new gems to bring you a little gift of science every day in the lead up to Christmas. http://bit.ly/RiAdvent17 The Ri is on Twitter: http://twitter.com/ri_science and Facebook: http://www.facebook.com/royalinstitution and Tumblr: http://ri-science.tumblr.com/ Our editorial policy: http://www.rigb.org/home/editorial-policy Subscribe for the latest science videos: http://bit.ly/RiNewsletter