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

Geoffrey Baer solves the mystery of a viewer’s “vague memory” from the 1940s, revisits an exhibit at the Century of Progress and opens the door to the Evanston History Center.

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.

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

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. 

Why are there so many long-eared owls showing up in Chicago this winter? Bird watchers call it an “irruption.”

Chicago will depend on residents to help enforce the city’s updated recycling ordinance – at least initially. The changes, which took effect Jan. 1, mark the first update to the city’s recycling rules in 20 years.

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.

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

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

Thanks to a new state law, officers partnered with a police dog are first in line to keep the dog once it is deemed no longer fit for service.

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

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

Organized by the nonprofit Center for Biological Diversity, Earth2Trump is a series of rallies aimed at building “resistance to all forms of oppression and all attacks on the environment,” the group states.

As the holiday season winds down, it’s about time to take care of that Christmas tree that has begun to decay in your living room.

The newborn female Bornean orangutan joins five other orangutans living at the Brookfield Zoo.