Fatwood is wood filled with resin or pitch. This is the best natural firestarter. They sell it online, but you can find your own. Because of fatwood, I have been able to start a campfire in the rain with damp wood while stranded overnight somewhere very remote. I knew what to look for and how to use it. In that instance, I found a tree that had exploded from freezing and knew the resin-loaded strips of wood were what I needed. It was later winter, cold, and we were in a storm. Because I had the knowledge and my überleben Zünden fire starter (I love that thing!), I was able to keep three of my family members and myself warm and cook us a great meal to boost our morale.