This is a video about how Japanese samurai swords, aka katanas, are made – from the gathering of the iron sand, to the smelting of the steel, to the forging of the blade. Head over to https://hensonshaving.com/veritasium and enter code 'Veritasium' for 100 free blades with the purchase of a razor. Make sure to add both the razor and the blades to your cart for the code to take effect.nnIf you’re looking for a molecular modeling kit, try Snatoms, a kit I invented where the atoms snap together magnetically - https://ve42.co/SnatomsV nn▀▀▀nA massive thank you to John McBride for making this entire project happen. This would not have been possible without John. Please check out his japan walking tours https://walkjapan.com/nMassive thanks to Craig Mod, Inoue-san, everyone in the Tanabe family, and Takanashi-san. Also a massive thank you to Kevin Cashen – https://cashenblades.com/nn▀▀▀nReferences:nTanii, H., Inazumi, T., u0026 Terashima, K. (2014). Mineralogical study of iron sand with different metallurgical characteristic to smelting with use of Japanese classic iron-making furnace “Tatara”. ISIJ international, 54(5), 1044-1050.nnTate, M. (2005). History of Iron and Steel Making Technology in Japan Mainly on the smelting of iron sand by Tatara. Tetsu-to-Hagane, 91(1), 2-10.nnKrauss, G. (1999). Martensite in steel: strength and structure. Materials science and engineering: A, 273, 40-57.nnKrauss, G., u0026 Marder, A. R. (1971). The morphology of martensite in iron alloys. Metallurgical Transactions, 2, 2343-2357.nnYalçın, Ü. (1999). Early iron metallurgy in Anatolia. Anatolian Studies, 49, 177-187.nnKapp, L., Kapp, H., u0026 Yoshihara, Y. (1987). The craft of the Japanese sword. Kodansha International.nnMatsumoto, C., Das, A. K., Ohba, T., Morito, S., Hayashi, T., u0026 Takami, G. (2013). Characteristics of Japanese sword produced from tatara steel. Journal of Alloys and Compounds, 577, S673-S677.nnInoue, T. (2010). Tatara and the Japanese sword: the science and technology. Acta Mechanica, 214(1), 17-30.nnnImages u0026 Video:nnGreat video from NHK – https://ve42.co/NHKnnnn▀▀▀nSpecial thanks to our Patreon supporters:nnAdam Foreman, Anton Ragin, Balkrishna Heroor, Bill Linder, Blake Byers, Burt Humburg, Chris Harper, Dave Kircher, David Johnston, Diffbot, Evgeny Skvortsov, Garrett Mueller, Gnare, I.H., John H. Austin, Jr. ,john kiehl, Josh Hibschman, Juan Benet, KeyWestr, Lee Redden, Marinus Kuivenhoven, Max Paladino, Meekay, meg noah, Michael Krugman, Orlando Bassotto, Paul Peijzel, Richard Sundvall, Sam Lutfi, Stephen Wilcox, Tj Steyn, TTST, Ubiquity Venturesnn▀▀▀nDirected by Petr LebedevnWritten by Petr Lebedev and Derek MullernEdited by Trenton Oliver, Jack Saxon, Peter NelsonnAnimated by Fabio Albertelli, Jakub Misiek, David SzakalynFilmed by Petr Lebedev and Lui KimishimanProduced by Petr Lebedev, Derek Muller, Han Evans, Giovanna Utichi, Emily TaylornThumbnail by Peter SheppardnnnAdditional video/photos supplied by Getty ImagesnMusic from Epidemic Sound
