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A regal fritillary butterfly, a local species that’s classified as threatened in Illinois.

Over the course of its history, the Peggy Notebaert Nature Museum has amassed a collection of about 390,000 animal specimens and artifacts. We get a close look at five of these rarely seen items.

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Pollution causes 10 million deaths per year, according to an upcoming report written by 50 researchers and policymakers, including Chicago-based energy experts.

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Eugene Cernan (NASA / Facebook)

The Chicago native died Monday afternoon at the age of 82.

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Cook County Board President Toni Preckwinkle

Cook County is ahead of schedule on its goal to reduce greenhouse gas emissions 80 percent by 2050, a new report shows.

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Amazon Echo (Adam Bowie / Flickr)

Amazon’s voice-activated digital assistant is a hot seller, but there are privacy issues.

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Why did the Trump transition team target Department of Energy staffers who worked on climate change? What does the future hold for climate research and nuclear weapons? A one-on-one interview with the current U.S. Secretary of Energy.

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(Chicago Tonight)

Chicago’s air traffic controllers and the pilots they guide have a new way of communicating that officials say will improve speed and safety. We explain how it works.

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Kelly Jarvis’ “Blood Flow in Fontan Circulation” won first place. Jarvis is with the departments of radiology and biomedical engineering at Northwestern University.

While many people may think that art and science have little overlap, an annual competition at Northwestern University proves that groundbreaking research can produce striking images.

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(Chicago Tonight)

Why aren't Chicagoans getting on the recycling bandwagon? What city officials are doing to reverse dropping participation rates.

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The animal welfare team at Brookfield Zoo tends to Zenda, a 10-year-old male lion who appeared to have a toothache. (Chicago Tonight)

What happens when a lion gets a toothache? Meet the large and dedicated team that cares for more than 3,000 animals at Brookfield Zoo. 

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Charles Darwin

More than 150 years after Charles Darwin published "On the Origin of Species," the man and his theories continue to generate controversy and debate. That academic battle plays out in a new book titled "Debating Darwin."

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(J.B. Spector / Museum of Science and Industry)

A new exhibit at the Museum of Science and Industry invites visitors to sail though time and explore the evolution of ship design. 

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Photo by Mike Zarnek: Supermoon. Taken from Glenview on Sunday 11/13/2016

November’s full moon will be no ordinary sight. From Sunday evening through early morning on Tuesday, stargazers will be treated to a radiant lunar spectacle that hasn’t occurred to this degree since 1948.

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(J.B. Spector / Museum of Science and Industry)

To get children and teens interested in science, technology and engineering careers, Chicago’s Museum of Science and Industry is planning a new program examining the world around us and the role of humans in it. 

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A map shows internet outages caused by the Oct. 21 DDoS attack. (Courtesy of DownDetector)

A massive cyberattack temporarily takes down major websites. Find out how hackers use household devices to wreak havoc online.

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Motorists will be without a single testing center within Chicago city limits starting Nov. 1.