When Robert G. Jahn and Brenda J. Dunne first embarked on their exotic scholarly journey more than three decades ago, their aspirations were little higher than to attempt replication of some previously asserted anomalous results that might conceivably impact future engineering practice, either negatively or positively, and to pursue those ramifications to some appropriate extent. But as they followed that tortuous research path deeper into its metaphysical forest, it became clear that far more fundamental epistemological issues were at stake, and far stranger phenomenological creatures were...