Very cool, I am watching this for the second time and noticed something I didn't before. Dan mentioned "the plants told me" when talking about a tribe knowing how a plant is good for medicine. There is a guy, quite famous in the self reliance circles named Tom Brown, he was kind of raised by an Apache Indian, anyhow he has mentioned in his books that if you have an ailment to go out into the woods (nature) and sit and meditate and the plant you need to heal you will make itself known to you. Funny how if you read a bunch from different perspectives things point the same way.