The Author, Grace Powell? Let’s just say she’s obsessed with why we fall in love, make impassioned commitments, then destroy relationships we spent years building. Her research as biochemist at Stanford Medical Center and Stanford Research Institute led to her fascination with brain states that make us whack-o when it comes to love. Her new novel is Until He Doesn’t. Tess’s funny, sexy adventures and her husband’s side of the story help us understand why fifty percent of adults say they’ve been unfaithful at some point in their lives.  The recent conclusion in neuroscience that infidelity is wired into our brains, makes this book a perfect choice for Book Club discussions.