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The Chicago River is a lot cleaner than it used to be. And after years of litigation, the Metropolitan Water Reclamation District and environmental groups have agreed to a settlement and will work together to make the river even cleaner. 

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An artist’s interpretation of what the surface of the exoplanet TRAPPIST-1f could look like. (NASA / JPL-Caltech)

NASA said earlier this week it had a major announcement coming Wednesday. What an announcement it turned out to be.

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Another record high temperature in Chicago. How long will spring in February last? 

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(Shedd Aquarium)

For the fifth year, members of Shedd Aquarium's Animal Response Team participated in a rescue mission of endangered penguin chicks in South Africa. Learn about their work.

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The Chicago History Museum partnered with Alan Rhodes to present historical events like the Valentine's Day Massacre through virtual and augmented reality. (Courtesy of Chicago History Museum)

Last fall, 21st century technology was used to tell the story of a 20th century tragedy: the Eastland Disaster. The team behind that project is set to launch a second installment of its augmented reality app. Learn more.

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Neil Shubin has traveled the world in search of fossils to help better understand evolutionary origins. He tells us about his latest research on Earth’s southernmost continent.

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The Illinois Emergency Management Agency warns Southern Illinoisans to be prepared for earthquakes. Just how great is the risk?

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(Lisle Police Department)

A bright meteor streaked across skies in Chicago and the Midwest at about 1:30 a.m. Monday. 

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Heartland Institute President and CEO Joseph Bast (Courtesy of Heartland Institute)

With an expected audience of officials appointed by President Donald Trump, the Heartland Institute hopes to reset U.S. climate policy, which is also the theme for its upcoming International Conference on Climate Change.

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(NASA)

Is rhetoric edging us closer to doomsday? Last week, the Doomsday Clock edged 30 seconds closer to midnight, putting the world two and a half symbolic minutes away from global annihilation. 

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(Solar Energy Industries Association)

Cook County is more than halfway through a multiyear project that aims to make solar energy more affordable for residents.

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On Thursday, the Illinois Environmental Council released its Environmental Scorecard, highlighting the top pieces of environmental legislation (and legislators) from 2016. 

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(Justin Hobson / Wikimedia Commons)

The increasing frequency of tornadoes, and a new study on gun violence. Those stories more from the world of science with Rabiah Mayas.

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The decadeslong fight to clean up the Chicago River took a step forward last week with the resolution of two lawsuits targeting phosphorous discharge that has polluted waters from Chicago to the Gulf of Mexico.

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(Daniel Dionne / Flickr)

Dozens of Chicago activists met last week to plan a defense of environmental policies that appear vulnerable under the administration of President Donald Trump.

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Peggy Notebaert Nature Museum's alligator snapping turtle, Patsy McNasty, moved into a bigger tank Jan. 19. (Alex Ruppenthal / Chicago Tonight)

Alligator snapping turtle Patsy McNasty moved into a new 300-gallon tank this week at Chicago's Peggy Notebaert Nature Museum, where visitors attended a “housewarming” event for the 14-pound turtle.