“Popper's falsifiability thesis resonates with a major methodological principle in my own Tibetan Buddhist philosophical tradition. We might call this the "principle of the scope of negation." This principle states that there is a fundamental difference between that which is "not found" and that which is "found not to exist." If I look for something and fail to find it, this does not mean that the thing I am seeking does not exist. Not seeing a thing is not the same as seeing its non-existence.”