Iowa high school science teacher John Cisna weighed 280 pounds and wore a size 51 pants. Then he started eating at McDonalds. Every meal. Every day. For 180 days. By the end of his experiment, Cisna was down to a relatively svelte 220 and could slip into a size 36. Cisna, who is Birmingham today and Wednesday to speak at a rally for area McDonald's managers, earned a new nickname, too. "In all those (previous) years, my nickname with my buddies was 'Snack Bar,''' Cisna said. "You know what they call me now? 'Snack Bar Jr.'" What turned out to...