Almost every evening I jog in the park near my house. I see all kinds of people doing all kinds of things, and this time I saw a middle-aged couple dancing. Sort of. No music or anything, just a man holding a woman in ballroom dance position, teaching her how to dance. She was so clumsy, her feet would barely move, and when they did they stumbled. No better way to put it. On my second lap around the park, day was giving way to night. And the two were still there in ballroom stance. He was still teaching, but…