From service dogs to household companions, a new book looks inside the complex world of a dog’s nose.

Donald Trump refuses to say he whether he will accept the results of the election. PBS “NewsHour” correspondent Lisa Desjardins joins us with the latest news from a contentious campaign.

An alderman’s plans for extending the 606 bike trail got viewers talking. Hear what they had to say when we read feedback from the Chicago Tonight website, and our Facebook and Twitter pages.

About 20 million years ago, a 13-foot predator swam in warm, shallow seas across the globe. This extinct shark was recently discovered by an international team of researchers led by a DePaul University professor.

The union's full membership will vote to approve or reject the tentative agreement with CPS inside schools across the district next week.

Twenty Cook County defendants deemed unfit to stand trial are to be placed in a mental health facility. So why are they sitting in jail instead?

Watch the Oct. 19, 2016 full episode of "Chicago Tonight."

Donald Trump attacks the media, and his accusers, as Hillary Clinton finds herself with a lead in national polls. A preview of what might be in store for Wednesday's final debate.

Chicago bumped San Francisco from its number two spot in this year’s ranking of U.S. travel destinations by Conde Nast Traveler.

A remarkable new app brings us face-to-face with the 1915 Chicago tragedy.

East Chicago residents are getting the toxic soil dug out of their yards. But why has it taken the EPA so long to begin cleaning up these neighborhoods?

Ruby Bridges became a civil rights icon at the age of 6, when she became the first African-American child to attend a previously all-white elementary school in New Orleans. She joins us in discussion.

Lake Calumet has changed shape and purpose many times over the years. Geoffrey Baer takes a look at its past and future in this week’s edition of Ask Geoffrey.

A plethora of pumpkins, eerie mind games and Dr. Ruth usher in the weekend – and Halloween. Here are 10 things to do in and around Chicago.

The United Educators of UNO reached a tentative agreement early Wednesday morning with the UNO Charter School Network to stave off what would have been the nation’s first-ever charter school teacher strike.