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Captions provided by CCTubes – Captioning the Internet! Dr Hannah Fry discusses Secret Santa, anonymity and derangements. And a better way to do it.
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Videos by Brady Haran
Artwork and animation in this video by Pete McPartlan
Support us on 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
