Imagine yourself in the beautiful Dolomites of Cortina d'Ampezzo. The air is thin and cold. The stars blaze in the night sky above you. Inside your body is the kind of fear that empties you, that vibrates between your ears, that makes your heart pump so fast you think it might explode in your chest. You are standing at the top of the terrifying, beautiful, sliding track. It is made of solid, hard…