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A philosophy professor offers exercises and tools to stretch the mind, offering new ways to consider, discuss, and argue positions on dangerous subject matter including evolution, the meaning of life, and free will. Daniel Dennett, one of the world's most original and provocative thinkers, takes readers on a profound, illuminating and highly entertaining philosophical journey as he reveals a collection of his favorite thinking tools, or "intuition pumps", that he and others have developed for addressing life's most fundamental questions.