MADISON, Wis. — A set of twins from Madison, Wis., have big plans for Friday: They will be celebrating their 11th birthday on the 11th day of the 11th month of 2011. Bouncing and squirming on their grandmother's couch, Betsy and Katie Overman are Whatever significance 11/11/11 has for you, the once-per-century numerical occurrence is…

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