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How can we test our brain health? What happens to the brain during pregnancy? And how easily does the brain heal from alcohol? On today’s episode, Dr. Sanjay Gupta, CNN’s Chief Medical Correspondent, answers listener’s questions about the inner workings of the brain, and shares what he has learned after decades in the operating room and reporting on this powerful, 3.5 pound organ. Plus, Dr. Gupta shares his top tips for keeping sharp.

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