A nor'easter over North Cambridge sounds like almost nothing — just the hiss of it on the storm windows and the plows working two streets over on Massachusetts Avenue. Snow Shovel Me answers the part no truck can reach: front stairs, stoops, walkways, back doors, and the packed ridge left at the foot of a driveway after the street is cleared. Shovels first, then salt or sand on the treads where ice sets up hardest. Porter Square wakes to steps you can climb and a clear path to the sidewalk, which on a February morning is the entire difference between a good day and a bad one. The service runs across Cambridge and the towns beside it, through storm nights and the mornings after.