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The Field Museum’s Matt von Konrat says that more than 3 million plant specimens have yet to be digitally cataloged. "We still have a ton of undiscovered diversity locked away," he said. (Courtesy of the Field Museum)

It's home to an estimated 30 million objects from across the globe, but only about 25 percent of the Field Museum's collection has been cataloged in a digital database. Starting Thursday, volunteers can help grow that percentage.

(Chicago Tonight)

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.

Artists of the New York-based company Rise of the Jack O’Lanterns can spend up to 15 hours on a single gourd. (Courtesy of Rise of the Jack O’Lanterns)

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.

Lake Calumet (Tom Kort / boatnerd.com)

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.

Norman Rockwell’s painting “The Problem We All Live With.”

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.

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?

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

Chicago River (Tim Emerich)

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

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.

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

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?

CTU President Karen Lewis said she's confident the union's 28,000 members will approve a tentative labor agreement with Chicago Public Schools next week. (Matt Masterson / Chicago Tonight)

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