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In a Sun-Times test, a parked car got dangerously hot in minutes, a reminder that leaving pets or children in a car, even briefly, can quickly turn deadly.
Other films included "National Lampoon's Animal House" and "Ordinary People."
From 1968 to today, volunteers in Chicago aim to connect visitors to their city, and to see some of the convention action themselves.
The June 19 federal and state holiday honors the day in 1865 when the last enslaved African Americans learned they had been freed — two years after the Emancipation Proclamation.