After a night of vivid dreams, I awake consumed by the thought that today might be the day I finally cheat on Chris. It's something I have fantasized about for years. And it won’t be a reckless impulse in the heat of the moment. This will be deliberate. Calculated. Seductive. I am lying in a hotel bed in San Francisco, attending an annual scientific conference, the most important in my field. I’m a planetary scientist. Al...