| | Guo Yu was a native of Guanghan. He studied the art of medical diagnosis. Emperor He found him extraordinary, so he had a test in which he ordered his favorite ministers with beautiful wrists to be mixed with women behind a curtain and asked Guo Yu to examine one hand from each. Guo Yu said, "The left pulse is yang, the right pulse is yin; there are men and women among them, their conditions differ as if they were different people." "I find it strange for this reason," he said. The emperor sighed and praised him highly.
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