The streetlights in Buenos Aires are considerably dimmer than they are in New York, one of the many things I learned during my family's six-month stay in Argentina. The front windshield of the rental car, aged and covered in the city's grime, further obscured what little light came through. When we stopped at the first red light after leaving the hospital, I broke two of my most important marital promises. I started acting like my wife's doctor, and I lied to her. I had just taken the PET scan, the diagnostic X-ray test, out of its manila envelope (Dr. Peter B. Bach, 5/6).