Last year, Phil Ball gave a very popular talk at the Ri about quantum mechanics, here's his follow up on quantum entanglement, and our friends Alice and Bob. Subscribe for regular science videos: http://bit.ly/RiSubscRibe Watch the talk that started the conversation: https://www.youtube.com/watch?v=q7v5NtV8v6I --- A very special thank you to our Patreon supporters who help make these videos happen, especially: Alessandro Mecca, Ashok Bommisetti, bestape, David Lindo, Elizabeth Greasley, Greg Nagel, John Pollock, Lester Su, Osian Gwyn Williams, Radu Tizu, Rebecca Pan, 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