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

Eliza Fournier is here from the Chicago Botanic Garden with tips on how to spice up your garden beds and keep the beauty blooming throughout the year. More on the Story: Gardening tips and how-to videos Chicago Botanic Garden website A Bloomin' Festival

Whether you're a biking novice or a cycling pro, this new bike book is sure to give you some places to explore on two wheels. We sit down with the author of Where to Bike Chicago: Best Biking in City and Suburbs.

We discuss the impact of climate change on polar bears with two prominent conservationists.

A collection of ethereal jellyfish make up the Shedd Aquarium's latest exhibit. We have some live in our studio! More on the Story: A slideshow of the jellyfish in the exhibit Shedd Aquarium jellyfish exhibit

A car door is a dangerous and unexpected obstacle that is dreaded by bicyclists around the world. We tell you how the state of Illinois is tracking bike crashes in an effort to make the streets safer for two-wheeled travelers.

They are the ultimate pollinizers; without them there would be no agriculture. But over the past five years, the bees in North America and Europe have been disappearing like never before. So what's going on? We speak with the director of a new documentary examining this phenomenon.

The Lurie Garden is in full glory at Millennium Park. We meet the gifted gardeners who've helped this urban oasis grow up healthy and green. The Lurie Garden website

We chat with Groupon founder Andrew Mason and the chairman of the Chicago tech company about its explosive growth and its future. While Groupon has taken off with consumers, not every business is giving their experience with the company a glowing review. More on the Story: One Chicago shop's experience Groupon's Chicago website

Researchers at the Rehabilitation Institute of Chicago published new findings today in the Journal of the American Medical Association. Ash-har Quraishi reports on the pioneering work aimed at neural control of prosthetic limbs for lower-limb amputees.

Preventing potentially deadly infections has become an increasing problem at many hospitals. Eddie Arruza looks at a high-tech way one Chicago hospital is trying out to eliminate healthcare-related infections and what patients should be asking their doctors and nurses.