| http://www.w3.org/ns/prov#value | - afarers developed a host of ingenious ways to find their way.Secrets 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 Kevlar to bioengineered silk.Report Video Problem??Before you submit an error, please consult our Troubleshooting Gui
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