Norway's Northug crosses the finish line ahead of Sweden's Halfvarsson to win the men's cross country...
Norway's Petter Northug celebrates after crossing the finish line ahead of Sweden's Calle Halfvarsson (not pictured) to win the men's cross country free/classic 4 x 10 km relay final at the Nordic World Ski Championships in Falun February 27, 2015. REUTERS/Kai Pfaffenbach (SWEDEN - Tags: SPORT SKIING)