Curious City is a news-gathering experiment designed to satisfy the public’s curiosity. People submit questions, vote for their favorites, and WBEZ reports out the winning questions in real time, on Facebook, Twitter and the timeline above.

Mark Eifert from Park Ridge asked: “The first sustained nuclear reaction was under the University of Chicago’s Stagg Field. Is that site still radioactive?” Third Coast Festival and WBEZ producer Katie Mingle investigates — with or without a hazmat suit.

Got any leads? Who should we talk to? Are there any old radioactive sites in your area? Comment below!