Neil Steinberg/Sun-Times “Walgreens,” observed the medical technician at a CVS in Franklin Park Tuesday, reading the vaccine card I handed him as I sat down behind the little blue screen and bared my upper right arm. Busted, patronizing the competition. I hadn’t considered the Cubs vs. Sox, Field’s vs. Carson’s aspect of crossing from Walgreens to rival CVS for my second dose of COVID vaccine. My older son, who set up my first appointment in Springfield, shifted the second to Franklin Park. Considerate boy. Not only a far shorter drive, but by changing, the doses were now the proper three weeks apart. Turns out Walgreens was giving the Pfizer shots a month apart, because it was easier for them to schedule. Until they were called on it and stopped.