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Delta, United, Southwest, American and Alaska Airlines and other say masks are now optional for travelers on their aircraft.

A Brazilian priest has made the mega-city of São Paulo pay attention to its homeless population's needs.

An estimated $600 billion in taxes will go uncollected this year because the IRS doesn't have the people and technology it needs to enforce the existing tax law.

Hundreds of thousands of Ukrainians are still living close to the front lines as Russia readies another offensive. Here's how people are surviving in the city of Mykoliav.

After the Crimea invasion, a backlash against Russian books filled with propaganda led to the growth of Ukraine's own book industry. But Russia's latest attacks and Covid have created major obstacles.

Elon Musk is trying to buy Twitter in a $43 billion takeover, which the company's board is attempting to resist. What's at stake, and where is all this going?

HIV remains a problem in the U.S. because people don't use life-saving prevention and treatments. COVID is heading down the same path. Here are insights from people fighting on the frontlines of HIV.

Elon Musk has been in headlines for trying to buy Twitter, but one Harvard historian says his brand of capitalism goes back to his teen years and a particular reading of science fiction stories.

Known for his sonic brashness and unyielding artistic vision, Birtwistle was awarded a British knighthood in 1988. He was one of the U.K.'s most prominent composers for decades.

The mask-wearing requirement had been initially imposed in early 2021, shortly after President Biden took office.