On a map, Harvard Business Review’s offices look far from the site of yesterday’s Boston Marathon bombing, seven miles up the winding Charles River. But in a city that feels more like a town, everyone in the area — as well as in cities and countries far beyond — has been shaken up by the Patriots’ Day explosions. And recently, we learned that one of the people killed, 29-year old Krystle Campbell, is the daughter of a longtime Harvard Business School employee. Her brother also works at Harvard, and Krystle had put herself through college working at the HBS dining hall.