President Obama's executive order on immigration was a game-changer. Carol Marin and her guests look at the impact it will have on undocumented youth, in Chicago and beyond.

A supercomputer at Argonne National Laboratory, code-named Mira, is the third fastest in the world, according to new rankings. We speak with the scientist in charge. 

What is American capitalism and can it last? We hear from the author of a new book.

How did a Magnificent Mile building end up being featured weekly in a 1970s network TV sitcom? Find out more in this week's Ask Geoffrey.

Lovers of used and rare books are mourning the impending loss of a celebrated and unusual neighborhood bookstore. Jay Shefsky has the story.

We asked for your thoughts about Illinois Medicaid cuts. We read what some of you had to say in Viewer Mail.

Joel Weisman and his panel of journalists discuss the week's top headlines.

Need some ideas for what to do this weekend? Chicago Tonight knows what is going on!

Gov. Pat Quinn signs a package of bills to save Medicaid from financial collapse. But the result is steep cuts to many in Illinois who rely on the coverage. Ash-har Quraishi has the details.

The U.S. Supreme Court's ruling on the controversial Affordable Care Act is expected in the next two weeks. A noted law professor and a health care specialist join us with their thoughts on how the justices may rule, and the implications of the decision.

Washington Post columnist E.J. Dionne Jr. talks about the growing political polarization in the U.S. and his new book, Our Divided Political Heart.

How can a water park change lives? We take a look at a new community center on the far south side that hopes to do just that.

A nightclub setting will host members of the Chicago Symphony Orchestra. We speak with the composer and DJ who is bringing the two worlds together.

We take another look at how lesbian and gay sailors are making waves -- and history -- at the Naval Station Great Lakes in North Chicago, as well as at the White House.

We asked if you would support a teachers' strike. We read what some of you had to say in Viewer Mail.