For the past two years, Norway’s Petter Northug has been the best in the world. One look at the medals tables from the 2009 World Championships and 2010 Olympic Games serves as proof: Over the 12 competitions at those two events, Northug took gold in five of them, and reached the podium on two other occasions. FasterSkier had the opportunity to talk with Northug over breakfast in Las Vegas in July, immediately following the rollerski...