Add the crush of holiday shipping, and we are reminded of how much America depends upon the USPS. A postal clerk at the Thayer Street station told me how irritated customers have been with Covid distancing restrictions. There's nothing to complain about: Your Christmas packages to Aunt Min in Kansas or the grandkids in Virginia are delivered quickly and safely for what seems a modest charge. Postal workers have been frontline heroes during the pandemic, helping the keep the country connected. The physical post office is the embodiment of the miracle. More than just a convenient place to buy s...