| http://www.w3.org/ns/prov#value | - Please copy this text to your clipboard.Problems Playing Video ?Report a problemClosed CaptioningRelated Links:NOVA's Why Ships Sink homepageE-Mail NewsletterShop NOVALEARN MORESecrets of Viking ShipsHow did longships and other vessels help the Norsemen navigate distant waters so successfully?Making Stuff: StrongerDavid Pogue tests his mettle against the world???s strongest stuff, from steel and
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