Numberphile

Thanks Audible: http://www.audible.com/numberphile More links & stuff in full description below ↓↓↓ Alex Bellos discusses slide rules and then the Halden Calculex, which he describes as the "iPhone of Slide Rules" Alex Bellos: http://www.alexbellos.com Slide Rule Museum: http://sliderulemuseum.com Purdue Libraries: https://www.lib.purdue.edu Support us on Patreon: http://www.patreon.com/numberphile 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 Numberphile is supported by the Mathematical Sciences Research Institute (MSRI): http://bit.ly/MSRINumberphile Videos by Brady Haran 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 Numberphile T-Shirts: https://teespring.com/stores/numberphile Other merchandise: https://store.dftba.com/collections/numberphile