WOOTZ steel from old drills . MAKING A VIKING SEAX!!! - YouTube
Twitter 上的 Celestial Sentinel:"Ulfberht Swords. All-steel swords from the Viking era. Dated from 9th to 11th centuries, with blades made from crucible steel inlaid with the inscription +VLFBERH+T or +VLFBERHT+ Sword from
Where did the Vikings gained the knowledge of crucible steel for making Ulfberht swords? Did they learn it from themselves? Did the Vikings had advanced native knowledge of science, philosophy, mathematics in