Vermont Conversation’s David Goodman goes from host to guest as he spends the first hour talking about one of his passions that isn’t politics and social justice. He shares his knowledge of backcountry skiing and discusses his new book, “Best Backcountry Skiing in the Northeast.” Then Dartmouth College Professor of Psychological and Brain Sciences Brad Duchaine shares his research into face blindness (or prosopagnosia). It’s fascinating stuff.