I am a rational person. So I don't think the world is going to end on December 21st. I have a friend who is obsessed with Terrance McKenna, the I ching and Time Wave Zero and he is constantly posting on Facebook about all that crap. When I see this person in real life, he will bring up this nonsense and begin talking about it like it is science fact. This friend of mind is not religious in anyway, but he is always talking about his "true calling" and discovering "the path you were meant to follow", and how he wants to discover, "the nature of the universe". It is very frustrating. Anyone have any advice on how to deal with this kind of zealous behavior?