A bit extra from our interview with Persi Diaconis. Main video: https://www.youtube.com/watch?v=AYnJv68T3MM Second video (catch or drop): https://www.youtube.com/watch?v=Obg7JPd6cmw Super bowl coin tosses: https://www.youtube.com/watch?v=bFfSfzjhfC8 Dynamical Bias in the Coin Toss: http://bit.ly/DynamicalBias NUMBERPHILE Website: http://www.numberphile.com/ Numberphile on Facebook: http://www.facebook.com/numberphile Numberphile tweets: https://twitter.com/numberphile Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran Support us on Patreon: http://www.patreon.com/numberphile Brady's videos subreddit: http://www.reddit.com/r/BradyHaran/ A run-down of Brady's channels: http://www.bradyharan.com/ Sign up for (occasional) emails: http://eepurl.com/YdjL9