Dr Tom Crawford has been known to strip to his underwear in the interests of math education. He is an Early Career Teaching and Outreach Fellow at Oxford University. Tom's page at St Edmund Hall - https://www.seh.ox.ac.uk/people/tom-crawford Tom Rock's Maths YouTube Channel - https://www.youtube.com/tomrocksmaths Tom's main website with links to most stuff - https://tomrocksmaths.com Numberphile videos featuring Tom Crawford - https://www.youtube.com/playlist?list=PLt5AfwLFPxWJ2TNTA79reKQ6S88kTvDR- This episode was supported by G-Research, a world-leading quantitative finance research firm, hiring the brightest minds to tackle the biggest questions in finance - learn more at gresearch.co.uk/numberphile/ - https://www.gresearch.co.uk/numberphile/ You can support Numberphile on Patreon - https://www.patreon.com/numberphile) like these people - https://www.numberphile.com/patrons With thanks to MSRI - https://www.msri.org