Winter of 1939. Finland is invaded by the Red Army. The Finns are far inferior in numbers and artillery. But they have “sisu” in greater quantities as the story goes. Using their cross-country skiing skills, they manage to surprise and disperse the Russian troops. The Finns describe “sisu” as the guts, the courage of the lesser. A mixture of audacity and perseverance which leads to never giving up, even when all seems lost. It is an inner strength that transforms one’s supposed inferiority to advantage by thinking out of the box. Joanna Nylund, author of “Sisu, the Finnish Art of …