Sybil Lockhart, a Berkeley neurobiologist, became a "mother in the middle" when she was pregnant with her second daughter and her mother was diagnosed with Alzheimer's disease. What makes Sybil's story different, and so powerful, is that she understood the neurological processes, by turns exciting and devastating, that were taking place in the brains of those she loved. Interweaving her scientific expertise with her own complicated emotions, she writes...