My 5-year-old son Ben likes to speculate on the reason a fire truck he sees has been summoned to the scene (we seldom see any smoke or flames). In Chicago, some fire engine crews are trained as paramedics, so if no nearby ambulance is free, a fire engine is sent in its place. This morning, Ben explained that the ambulance was busy because "maybe they were doing a crossword." Emergency medical assistance can wait! First, the daily puzzles. My boy is learning his priorities here.