Host intro: Every spring before Passover, Coca-Cola plants in Chicago, New York, Atlanta and other cities whip up a tiny batch of soda that's Kosher for Passover. The run lasts about two weeks and has been known to sell out in less than 24 hours. But why is this Coke different from all other Cokes? Last year, Laura Kwerel went down to West Rogers Park, in Chicago, to find out.