Growing up in a passionately Norwegian-American Iowa town, Lori Erickson rolled her eyes at traditions like Nordic Fest and steaming pots of r mmegr t. But like many Americans, she eventually felt drawn to genealogy, the "quintessential hobby of middle age." Her quest to know more about the Vikings and immigrants who perch in her family tree led her to visit Norse settlements and reenactments, medieval villages and modern museums, her picturesque...