The Secret of Japanese Swords - Science View

[Skip Intro] https://www.seevid.ir/fa/w/e8xJL3d_VNs Learn more about science on NHK WORLD-JAPAN: https://www3.nhk.or.jp/nhkworld/en/ondemand/category/23/?cid=wohk-yt-2402-sv312-hp More quality content available on NHK WORLD-JAPAN: https://www3.nhk.or.jp/nhkworld/en/ondemand/video/?cid=wohk-yt-2402-sv312-hp Japanese swords forged with techniques forgotten by time, may be on the edge of a breakthrough.