Oxygen levels have dropped in hundreds of lakes in the United States and Europe over the last four decades, a new study found. And the authors said declining oxygen could lead to increased fish kills, algal blooms and methane emissions.

Though it may have been one of the quirkier bills passed by the General Assembly, the designation recognizes the role Illinois played in the development of one of the world’s greatest wonder drugs: penicillin.

To counter a pervasive, if unconscious, bias toward male birds within North American ornithology and hobbyist circles, a group dubbed the Galbatross Project launched Female Bird Day, now in its second year, running Memorial Day weekend.

For three months out of the year, Chicago’s every bit as much of a beach town as Los Angeles or Miami. As we kick off summer 2021, here are some things you might not know about the city’s sandy shore.

Along with the kick off to beach season, a number of other outdoor attractions are opening up in Chicago over Memorial Day weekend.

Surveillance cameras recently captured images of a mylar balloon bumping up against the nesting site of Chicago’s beloved pair of piping plovers. Wildlife advocates have long been critical of such inflatables and the dangers they pose to birds and other animals.

The city’s lakefront beaches will officially open Friday for the first time since 2019, with lifeguards on duty and concessions returning. 

The unusually high volume of seeds falling from trees this spring, especially from the city’s elms, is indicative of drought, said Jeff Brink, senior forester with the Chicago Department of Transportation.

Chicagoans aren’t in the right place or time zone to see Wednesday’s lunar eclipse at its peak. Just when the show gets interesting, the moon will sink from view.

Federal officials have removed the last of the 68 big cats from the private zoo in Oklahoma that had been the center of the “Tiger King” saga.

Virgin Galactic on Saturday made its first rocket-powered flight from New Mexico to the fringe of space in a manned shuttle, as the company forges toward offering tourist flights to the edge of the Earth’s atmosphere.

Liam Durnan has been on a yearlong caper, hiking all 350 miles of Cook County forest preserve trails. “When people picture the forest preserve nearest them, most people think of it being the picnic groves,” he said. “They don’t know how big this thing is. It’s just incredible.”

In yet another sign that Chicago is bouncing back to life, the city’s premiere fountain will be switched on for summer after being sidelined in 2020.

While expectant parents Monty and Rose do the heavy lifting of incubating their clutch of eggs, the rest of us can help prep for the little ones by submitting suggestions for names.

Some parts of the country still face gas shortages related to the Colonial Pipeline ransomware attack, and the incident has drawn attention to the growing threat cyberattacks pose in the U.S. and around the world. We discuss the increasing threat and what to do about it.

Millions of specimens collected by the Field, not for exhibits but for scientific study, are unlocking mysteries of evolution and could answer questions about climate change.