The difference between Norse's discovery and Columbus's discovery is that the Norse discovered the new world about 500 years before Columbus was born.
While Columbus mistakenly stumbled into the new world while on voyage to India, Norseman Erikson a Viking explorer went searching for the new world after he heard about it from a trader trader Bjarni Herjolfsson.
In summary, the difference between Norse's discovery and Columbus's discovery is that Norse specifically set out to find America while Columbus mistakenly stumbled into America on his route to Asia.
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