Nova: Secrets of the Viking Sword
The Vikings were far more technologically advanced than they are often given credit. The swords of their "Ulfberht" forge were nearly indestructible and briefly advanced metallurgy by nearly a thousand years of the 19th century, when such practices would be common place. And yet, little had been known about Ulfberht until now. 2012/color/60 min/NR/widescreen.