While on a winter fishing trip with Vernon Evan, a respected Yupik Eskimo Elder, he taught me to pay attention to ones surroundings. Catalog all the natural resources you pass and remember where you saw them. Notice where the birch is, the dried grasses, the spruce pitch, and all other natural materials as you travel through the wilderness. If you fall trough the ice in twenty below zero you have precious little time to save yourself. Knowing where the dried gasses are so you can stuff your clothes with this insulator and where the spruce pitch and birch bark are, so you can start a fire, will save your life.