 As one might expect, there is a wide variety of interpretations of NDEs, from those that interpret the experiences as literally revealing a state that lies beyond death to interpretations that attempt to debunk the experiences by classifying them as mere reflections of abnormal brain states. Clearly, there is no one medical or physiological cause; the experiences occur for persons in a great variety of medical conditions. An interesting counterexample to explanations in terms of the “dying brain” is found in the NDEs experienced by mountain climbers in the midst of what they expected to be fatal falls (Heim 1892); it is hardly credible that these experiences can be reduced to either drugs or oxygen deprivation.