On Thursday the snow stopped long enough for me to make my escape from Heath, onward to Cambridge, MA for a visit with my son and a writer's workshop organized by the Garden Writer's Association. And what did I see when I got to Cambridge, MA?  Snow. And ice. And icy icy sidewalks.  I should have brought my YakTrax. I think snow is more of a problem in a city, but the trip was more than worth it.…