It's not much now, but find out how the city plans to transform a three-mile long abandoned railway. Paris Schutz takes us for a journey down the Bloomingdale Trail. More on the Story: Web article & photo gallery Bloomingdale Trail website

Do cell phones cause cancer? And what exactly does the World Health Organization have to say about it? A Chicago scientist who contributed to the latest report joins us to clarify the findings.

Groupon Inc. has filed for an initial public offering of stock worth up to $750 million. Jim Kirk from Crain's Chicago Business joins us to discuss the local company's latest business move. Article on the filing Groupon website

Henrietta Lacks died of cervical cancer in 1951. But her cells kept living. They started a scientific revolution and a multi-billion dollar industry. When members of her family found out, they felt angry and exploited. We talk with the author of a best-selling book about the story. More on the Story: Read and hear an audio excerpt from the book Author Rebecca Skloot's website

A futuristic library lands on the University of Chicago campus. But where do they keep the books? Find out when we get a tour of the latest striking addition to Chicago architecture. More on the Story: See photos of the library and watch a video The Library website

If you can't get to a grocery store, let it come to you. Paris Schutz has more on an innovative solution to the problem of food deserts in Chicago. More on the Story: More about the mobile market Fresh Moves

Chicago leads the nation in adapting to climate change. WBBM Newsradio 780's Kris Kridel joins us with that and a look at the week's top business headlines. Article on the Com Ed rate hike Article on the drop in Chicago's unemployment rate

Imagine a world without fish. That's what author Mark Kurlansky did in his new book, and he didn't like what he saw. He tells us what it would mean if our oceans became nearly barren. Mark Kurlansky More on the book Marine Stewardship Council

This week on Chicago Tonight: The Week in Review, Rod Blagojevich, Mayor Rahm Emanuel and Congressman Jesse Jackson Jr. take the stand in the Blagojevich retrial. The Mumbai terror trial here gets international attention. ComEd gets its controversial rate hike approved. The legislative session is scheduled to end soon with redistricting and the state budget still unsettled. And in sports, a late game collapse dooms the Chicago Bulls' season. Guests:

We fly on a fully restored World War II bomber and meet a man who flew 35 missions as a tail gunner. The Collings Foundation

The EPA this month ordered state officials to make the Chicago River clean enough for swimming. Paris Schutz has more on the decision and why many aren't happy about the river's new direction.

A GPS that gets you there by the most fuel efficient route, a mass extinction of fish that paved the way for human evolution and a nose that can smell bacterial infections are just three of the science stories we're keeping an eye on in tonight's installment of Scientific Chicago.

This home is believed to be one of the most energy-efficient homes in the country. But not everyone is ecstatic about the eco-friendly home's impact on the surrounding environment. Ash-har Quraishi reports on the growing pains of going green in the city.

How did the village of Winnetka solve a dangerous and tedious transportation problem 70 years ago? Geoffrey Baer tells us about the "big dig" in Ask Geoffrey.

A new exhibit showcases the efforts of 10 internationally known designers to offer eco-friendly solutions that meld sustainable materials with aesthetic design. Ash-har Quraishi has the story.

They're back... and that's not exactly fine and dandy with some Chicago residents. Chicago Tonight has the story of why there are more dandelions than ever, and why the Chicago Park District says that's a good thing. Chicago Park District press release