Hannah’s book is out now! https://www.waterstones.com/book/rutherford-and-frys-complete-guide-to-absolutely-everything-abridged/adam-rutherford/hannah-fry/2928377065652 https://www.amazon.co.uk/dp/1787632636/ If you have a spare 2⅔ hours you can watch Matt hand craft a protractor. Yes, I know the audio is glitchy. https://www.youtube.com/watch?v=rSox1RRbxXA More about Abu Arrayhan Muhammad ibn Ahmad al-Biruni: https://mathshistory.st-andrews.ac.uk/Biographies/Al-Biruni/ This video was made possible by my Patreon supporters for. Those cocktails were officially on you. https://www.patreon.com/standupmaths CORRECTIONS - None yet! Let me know if you spot any mistakes. Editing and filming by Trunkman Productions https://trunkman.co.uk/ Protractors by Matt Parker Music by Howard Carter Design by Simon Wright and Adam Robinson MATT PARKER: Stand-up Mathematician Website: http://standupmaths.com/ US book: https://www.penguinrandomhouse.com/books/610964/humble-pi-by-matt-parker/ UK book: https://mathsgear.co.uk/collections/books/products/humble-pi-signed-paperback