Karl Zener tried for years to remove his name from the cards that would forever be associated with ESP testing. We go into the history of these strange cards and talk in-depth about the lengthy (and oft hilarious) research that went into psychical phenomena at Duke University during the 20th century.

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Diana's notes, details, musings, and links for this particular episode: https://homespunhaints.com/what-are-zener-cards