Algorithms are increasingly used to make decisions in healthcare, transport, finance and security. How can they best be used and what happens when things go wrong? Subscribe for regular science videos: http://bit.ly/RiSubscRibe Buy Hannah's book "Hello World": https://geni.us/Has6 Hannah Fry takes us on a tour of the good, the bad and the downright ugly of the algorithms that surround us. She lifts the lid on their inner workings, to demonstrate their power, expose their limitations, and examine whether they really are an improvement on the humans they are replacing. Watch the Q&A: https://www.youtube.com/watch?v=6oWliz-bNvQ Hannah Fry is an Associate Professor in the mathematics of cities from University College London. In her day job she uses mathematical models to study patterns in human behaviour, and has worked with governments, police forces, health analysts and supermarkets. Her TED talks have amassed millions of views and she has fronted television documentaries for the BBC and PBS; she also hosts the long-running science podcast, ‘The Curious Cases of Rutherford & Fry’ with the BBC. This talk and Q&A were filed at the Ri on 30 November 2018. --- A very special thank you to our Patreon supporters who help make these videos happen, especially: Dave Ostler, David Lindo, Elizabeth Greasley, Greg Nagel, Ivan Korolev, Lester Su, Osian Gwyn Williams, Radu Tizu, Rebecca Pan, Robert Hillier, Roger Baker, Sergei Solovev and Will Knott. --- The Ri is on Patreon: https://www.patreon.com/TheRoyalInstitution and 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 Product links on this page may be affiliate links which means it won't cost you any extra but we may earn a small commission if you decide to purchase through the link.