Is a pre-Columbus map of North America truly a hoax?

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"In a Yale University library sits a map depicting the New World that predates the landing of Columbus by 60 years--if it isn't a fake. Although the lines on the so-called Vinland map are faded, those between scientists on the controversy are sharp. New salvos regarding its authenticity now come from both sides."

This is a fascinating story, not least because of the elaborate detective work that is part of the debate as to the authenticity of the map.
I bet it will make a great book once it's settled.