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Can an app reduce a person’s depression or anxiety? Or predict when someone might have a manic episode? Researchers from two local universities say yes.

From San Francisco to Stockholm, stories of people who started small and ended up solving problems in their community.

Pollution causes 10 million deaths per year, according to an upcoming report written by 50 researchers and policymakers, including Chicago-based energy experts.

A regal fritillary butterfly, a local species that’s classified as threatened in Illinois.

Over the course of its history, the Peggy Notebaert Nature Museum has amassed a collection of about 390,000 animal specimens and artifacts. We get a close look at five of these rarely seen items.

(Chicago Tonight)

Thousands of teachers miss class time within Illinois each week, and thanks to a shortage of substitute teachers, an average of 600 K-12 classrooms are left without an educator each school day, according to a new statewide study.

Former Chicago Public Schools CEO Paul Vallas on his new appointment to the board of beleaguered Chicago State University.

Watch the Jan. 17, 2017 full episode of "Chicago Tonight."

Dean Angelo, president of the Chicago chapter of the Fraternal Order of Police, gives us his take on the U.S. Department of Justice report on the Chicago Police Department.

“Hamilton” dancer Yossi Chaikin. (Chicago Tonight)

One of the dance captains of “Hamilton” taught a master class at a Chicago school for the arts. We were there to witness the cultural exchange.

The Chicago Police Department’s Procedural Justice training. (Brandis Friedman / Chicago Tonight)

Chicago Tonight sits in on a training class that aims to teach Chicago police officers how to better engage with the community.