Overview:Did a UFO fly over O’Hare Airport? How did the alligator later named "Chance the Snapper" suddenly appear in Chicago’s Humboldt Lagoon? Is Hull House haunted? Why don’t Chicagoans put ketchup on their hot dogs? WTTW award-winning host/writer/producer Geoffrey Baer sets out to solve these and other puzzlers in WTTW’s CHICAGO MYSTERIES.