Mass shootings, political violence and school safety are front of mind for many Americans following a recent spate of high-profile attacks. Experts who study gun violence unpack the data and trends.

Europe is warming faster than any continent. That's speeding up glacial melt, which is already threatening Europe's largest rivers.

New Zealand's unique birds are at risk of extinction, like the kiwi. So the country is trying to eradicate the invasive species that prey on them. Everyday people are lining up to help.

Analysts and law enforcement authorities are still sifting through evidence and conducting interviews to learn as much as they can about the suspect's beliefs, including bullet casings with messages inscribed on them.

Elizabeth Miller and Brett Eagleson both lost their fathers on September 11, 2001. On the 24th anniversary of the day, they remain divided on how justice should be done.

Utah officials say the suspected shooter was dressed in "all dark clothing" and fired from a long distance, potentially on a roof.

Tens of millions of voters have had their information run through the tool — a striking portion of the U.S. public, considering little has been made public about the tool's accuracy or data security.

The effort to keep schools safe from mass shooters has ballooned into a multibillion-dollar industry. Companies are selling school districts assurance with high-tech products.

During President Trump's first term, transgender troops were told they needed to be diagnosed with gender dysphoria to keep their jobs. Now, the military is using that to put them on administrative leave.

After Congress clawed back public media funding, PBS says it's cutting 15% of its staff, or more than 100 jobs.

The Trump administration is using decades-old laws, meant to prevent discrimination, to threaten school districts and states with cuts to vital federal funding.

Nongovernmental groups like the League of Women Voters are now barred from registering new voters at naturalization ceremonies, the U.S. Citizenship and Immigration Services has announced.