Records related to an April spill of a toxic metal into a Lake Michigan tributary have not been given to Chicago. The city is now threatening to sue U.S. Steel.

The field to take on Cook County Board President Toni Preckwinkle is growing. Todd Stroger, who formerly held the post, is announcing plans to run for his old office next year.

China’s most prominent environmental activist talks about the country’s pollution crisis.

The days when Americans fretted over an imminent U.S.-Soviet nuclear showdown might be over, but the consequences of a new nuclear age are still reverberating today.

A new mini power grid supplied by wind and solar helps the Illinois Institute of Technology meet its 21st century power needs.

Illinois Republican Congressman Peter Roskam says that criticisms of the recently passed House GOP tax cut bill are “hyperbole.”

Inspired by the song “My Shot,” from the blockbuster musical, actor Miguel Cervantes is challenging the public to take their “shot” and help raise awareness and funds to find a cure for epilepsy. 

Cook County Board President Toni Preckwinkle can expect easy passage of a revised spending plan, though Commissioner Jesus “Chuy” Garcia said he hasn’t made up his mind about how he’ll vote.

A new $960,000 grant will improve 2.5 miles of streams for nearly 20 species of fish and create 10 acres of neighborhood green space in the Chicago-Calumet region. 

A mass exoneration in Cook County clears 15 men. Proposed layoffs in the wake of the failed soda tax. And controversy over playmaking decisions by Bears coach John Fox.

The civil rights advocate announced Friday that he was diagnosed with the progressive degenerative disorder in 2015. 

Watch the Nov. 16, 2017 full episode of "Chicago Tonight."

Illinois U.S. Rep. Luis Gutierrez on Wednesday was one of six House Democrats who formally moved to impeach President Donald Trump by filing articles of impeachment.

Imagine learning your father was prison pals with notorious murderer Nathan Leopold. That’s the true story told in a new graphic novel.  

A Mexican wolf pup born this spring at Brookfield Zoo and released into the wild as part of a species recovery program was tracked down in New Mexico and is healthy, the zoo announced this week.