Earlier this year, my sister and I went to San Francisco’s marvelous art museum, the Palace of the Legion of Honor. We had a great time, but my sister lives with a chronic autoimmune disorder and can only stand and walk for so long. So after about an hour, we headed for the lounge area and made ourselves comfortable, until it became clear that we were not welcome in that space. One of the symptoms of her condition is lung congestion, which leads to periodic bouts of coughing. One struck just as