Should mathematics be done for its pure beauty or should it have practical uses? And why are many mathematicians so bad at outreach? Discussion with famous French mathematician, Cédric Villani. More Villani videos: http://bit.ly/Villani_Videos Numberphile videos on Magic Squares: http://bit.ly/MagicSquareVideos Cédric Villani website: http://cedricvillani.org/ His book Birth of a Theorem (Amazon): http://bit.ly/BirthOfATheorem Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile We are also supported by Science Sandbox, a Simons Foundation initiative dedicated to engaging everyone with the process of science. NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Subscribe: http://bit.ly/Numberphile_Sub Videos by Brady Haran Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ Brady's latest videos across all channels: http://www.bradyharanblog.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9