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BY ROBERT EIDELBERG IN HIS UNIQUE SERIES OF INTERACTIVE BOOKS ON KNOWING AND THINKINGWE DON’T KNOW: The Book of Non-Knowledge and the Volume of Our Current IgnoranceGOOD THINKING: A Self-Improvement Approach to Getting Your Mind to Go from Huh? to Hmm to Aha!PLAYING DETECTIVE: A Self-Improvement Approach to Becoming a More Mindful Thinker, Reader, and Writer by Solving MysteriesEVIDENTLY, MY DEAR ARMCHAIR DETECTIVE: Solving Ten Classic Mysteries Together With Their Celebrated SleuthsWHO’S THERE? in Shakespeare’s Hamlet — That Is the Question!