Oct. 9 might be Leif Erickson Day, but don’t go grabbing that horned hat just yet.The day celebrates the 11th-century Norse explorer who is credited with sailing to Newfoundland, Canada, and settling Vinland hundreds of years before Christopher Columbus ventured forth.But Erikson’s story — and that of the Vikings — is rife with misinformation. For one, there is no evidence that they wore the now-famous