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Scientists have found female eggs growing in the testicular tissue of some male largemouth bass taken from the Des Plaines River. (Jonathunder / Wikimedia Commons)

We speak to the co-author of a newly published study in which scientists dissected 51 male largemouth bass and found that 21 – some 41 percent – had grown female eggs in their testicular tissue.

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An event combining rousing orchestral music with high-definition NASA footage of the cosmos is coming to Ravinia Festival in Highland Park this week.

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Ornate box turtles are a threatened species in Illinois due to habitat loss, but they've recently been released onto a wild sand prairie. (USFWS)

Thanks to an experimental program started by the U.S. Fish and Wildlife Service in 2009, a wild population of threatened turtles has been established in northwestern Illinois. Find out how local institutions helped the agency reach its goal.

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The mayor announced Thursday the city's Bureau of Forestry would plant 3,000 new trees this year. (Streets and Sanitation Department)

Amid public outcry over police oversight, rising crime and uncertainty surrounding the cash-strapped Chicago Public Schools, Mayor Rahm Emanuel had some good news for city residents on Thursday.

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A Guam kingfisher at Lincoln Park Zoo. This type of bird now only exists in captivity. (Heather Paul / Flickr)

In the mid-1980s, the Lincoln Park Zoo and Brookfield Zoo set up critical captive breeding populations of two bird species native to the Pacific Islands. A new report from the Center for Biological Diversity underscores the impact of such programs.

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This illustration depicts NASA's Juno spacecraft successfully entering Jupiter's orbit. (Credits: NASA/JPL-Caltech)

Juno is set to uncover what Jupiter has been hiding. After a five-year, 1.75 billion mile voyage, NASA's spacecraft named after a Roman goddess successfully entered into orbit around the largest planet in our solar system Monday night. 

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Hiss Majesty, a 16-year-old Caiman lizard at the Shedd Aquarium, was fitted for a new prosthetic limb on Wednesday.

Hiss Majesty, a 16-year-old Caiman lizard at the Shedd Aquarium, was fitted for a new prosthetic limb on Wednesday.

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The Lincoln Park Zoo welcomed the birth of a female Grevy's zebra on Saturday. (Todd Rosenberg / Lincoln Park Zoo)

The Lincoln Park Zoo welcomed the birth of a female zebra on Saturday. It's the first zebra birth at the zoo since 2012.

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Since its creation in 1946, Argonne National Laboratory has been at the forefront of scientific research. Lab director Peter Littlewood joins us to discuss 70 years of scientific discovery.

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The city of Waukesha on Tuesday was given a green light to divert water from Lake Michigan for its drinking water supply after eight representatives from the states that border the Great Lakes voted unanimously to allow the diversion.

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Monday marks a rare celestial event for stargazers: For the first time in decades, the full moon falls on the summer solstice.

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This bighead carp was caught in the Illinois River, the principal tributary of the Mississippi River. There are no North American fish large enough to eat Asian carp, according to the Asian Carp Regional Coordinating Committee. (USGS)

A process similar to making soda water may be an effective strategy in warding off an Asian carp invasion that’s threatening the health of the Great Lakes, including Lake Michigan.

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The Shedd Aquarium has added a new source of power as part of its green initiative – and it isn’t coming from the institution's electric eels.

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Some farm groups are criticizing a new report about the hazards of atrazine, a herbicide that was banned by the European Union more than 10 years ago.

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The Environmental Protection Agency recently installed a park bench equipped with air pollution sensors at a CPS elementary school. It's one of just seven such benches in the U.S.

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Two years ago, amateur photographer Josh Feeney spotted a nest of owls within a Cook County forest preserve. Since then, he's returned to the site to check on the rare species and recently found evidence of successful breeding.