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Ask almost anyone you know about how their mood changes during the course of the day, and you’ll get evidence that the way our minds and emotions respond to the clock is no small matter.  But to according bestselling author Daniel Pink, the power of "chronobiology" is like an iceberg — we see only the small piece of its monumental role in shaping our days, our careers and our lives.  He joins us in the studio to talk about his new book When: The Scientific Secrets of Perfect Timing.