As this long, dark New England winter drags on, Harvard psychiatrist Jacqueline Olds has a reminder for a region now three weeks late for work and struggling with a bad bout of seasonal blues: Spring is coming. She also has some advice. In an interview with the Gazette, Olds, an expert on seasonal affective disorder (SAD) and co-founder of a startup that makes devices for tracking personal exposure to bright light, prescribed doses of sun and...