Banzai.

[denny]

http://haha.nu/amazing/a-samurai-sword-vs-bullet/

Comments

[azekeil.livejournal.com]

Yes - they fold two types of metal - one supple, the other hard 'a thousand times' - in reality they fold it only a few times (10?) to make 2¹⁰ = 1024 layers of metal. This means the blade is strong but supple, and is able to keep a very good edge.