Andrea Buchanan lost her mind while crossing the street one day. Suffering from a horrible cough, she inhaled the cold March air, and choked. She was choking on a lot that day. A sick child. A pending divorce. The guilt of failing, as a partner, as a mother. Relieved when the coughing abated, she thought it was over. She could not have been more wrong.When Andrea coughed that day, a small tear was ripped in her dura mater, the membrane that covers the brain and spinal cord. But she didn’t know that yet. Instead, she went on with her day, unaware that her cerebrospinal fluid was already...