House Speaker Nancy Pelosi launched a formal impeachment inquiry against President Donald Trump on Tuesday, acquiescing to mounting pressure from fellow Democrats.

How does scientific discovery happen? And what goes right when the process works? Those are some of the questions behind a newly launched center at Northwestern University’s Kellogg School of Management. 

He was a fast-rising Republican politician whose career came crashing to a halt last year. Now sober, Aaron Lawlor says he has given up politics but regained his life – and he’s eager to tell his story.

The population at Brookfield Zoo is growing. Last week, the zoo adopted two California Sea Lions – both with health issues. We meet Carolyn and Sabiena as they get physical exams at the zoo.

Investors in municipal bonds are increasingly weighing the effects of climate change in their calculations, and a new report out Tuesday from Moody’s Investor Service indicates Illinois bonds are not going to benefit from the new math.

A new ordinance has been introduced in City Council to severely reduce farm animal adoption in Chicago. We discuss the proposal with Ald. Raymond Lopez and Laura Calvert of Advocates for Urban Agriculture.

Albert Woodfox was held in solitary confinement for decades in Louisiana before his release in 2016. Now, he’s written a book about his experiences. He joins us to discuss “Solitary.”

The Federal Bureau of Investigation has honed in on another powerful elected official from Chicago, but it isn’t saying why.

Two groundbreaking novels – E.M. Forster’s “Howards End” and D. H. Lawrence’s “Sons and Lovers” – are currently receiving world premiere productions on Chicago stages. And despite their creation more than a century ago, they remain exceptionally timely.

Although proficient on a number of instruments including guitar, violin, cello and trumpet, Robert Hunter, whose songs included such classics as “Truckin’” and ‘‘Uncle John’s Band,” never appeared on stage with the Grateful Dead.

Watch the Sept. 24, 2019 full episode of “Chicago Tonight.”

Less than 1% of Chicago crosswalks have accessible pedestrian signals. A new lawsuit filed against the city claims that’s indicative of a “systemic failure.”

The number of vaping-related illnesses in the U.S. could soon climb much higher, a public health official said Tuesday.

After the Chicago Bears’ offense was slow to get going this season, Mitchell Trubisky was excited to speed things up.

It’s Banned Books Week, an annual event organized by the Chicago-based American Library Association to highlight the threat of censorship. Find out which books were challenged most in 2018.