How long should Americans expect to live like this — separated from friends, coworkers and classmates? Experts say they don’t know. The answer also depends “on how we respond over the next few days,” said Samuel Scarpino, an assistant professor at Northeastern University’s Network Science Institute, and “if we increase the amount of social distancing, remote work, school closures, etcetera,” or blithely ignore the advice of public health officials by going to crowded bars and restaurants, as many in […]