10 Objects From Time Travelers That Changed The Course Of Humanity
Medieval European blacksmiths worked with bloomery iron, a low-grade material full of slag inclusions and carbon impurities. Their forges couldn't reach the temperatures necessary to fully liquefy iron, which meant they couldn't remove the contaminants that weakened their weapons. A typical Viking-era sword would bend, chip, or shatter under sustained combat. Warriors expected their blades to fail. The Ulfberht swords didn't fail.

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