Lawmakers, staff and visitors were forced to evacuate the 129-year-old Iowa Capitol one day in April when smoke and a strange burning smell billowed from behind the Senate chambers.

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Lawmakers, staff and visitors were forced to evacuate the 129-year-old Iowa Capitol one day in April when smoke and a strange burning smell billowed from behind the Senate chambers. Fire alarms sounded and sirens blared as firefighters responded a little before lunchtime, but they found no fire. The source? A container of macaroni and cheese cooked to a...