Three months after his stroke, information about Sen. Mark Kirk's condition remains closely guarded.

An evolutionary biologist tells us why the gap between humans and primates is even smaller than we think.

It's smelt fishing season! Geoffrey Baer tells us more about this delicious Chicago tradition in tonight's Ask Geoffrey.

The emerald ash borer is devastating ash trees in the area. We meet some researchers who are trying to understand the tiny green bug well enough to find an ash tree that can co-exist with this pervasive pest. 

The U.S. Senate voted Monday on the so-called Buffett Rule.

Eddie Arruza and his panel of journalists discuss the week's top headlines.

The Chicago Infrastructure Trust will will now have an alderman on its board of directors and require City Council approval of its projec

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

Time is drawing near for a solution to the state's $83 billion pension crisis. Just what will a final solution entail?

It was yet another outrageous comment from Ozzie Guillen-- but at least one observer says the remarks about Fidel Castro should spark a l

Cook County's chief medical officer joins us to talk about the county's STD testing initiative, and more health stories. 

Searching for your ancestors used to be expensive and time-consuming. Now, it's easy and more popular than ever. We learn more about modern-day genealogy.

The Civil War as seen through art and images in Chicago collections. We have the story about a new online effort to illustrate the great conflict.

A tiny, fingernail-sized organism that some are calling the scourge of the Great Lakes is fundamentally altering marine life. Ash-har Quraishi reports on a devastating invasive species that is causing ripples all the way up the food chain.

What do you think about using taxpayer money to help renovate Wrigley Field? We have your thoughts in tonight's Viewer Mail.