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The nation's aviation infrastructure is again under scrutiny, following a series of paralyzing communications and radar outages at some of the country's busiest airports. Here is a look at the scientific origins of radar.

The Afghan-born former diplomat served as U.S. ambassador in Kabul under President George W. Bush. In Afghanistan, views of Khalilzad are mixed, with some blaming him for many of the country's woes.

More than 10,000 federal employees who had yet to complete their probationary periods have been fired by the Trump administration, including those who work to protect American agriculture.

It all started with a funeral in Liberia. Guests fell ill but no one knew why. Time to summon the "disease detectives."

Clint Hill, the Secret Service agent who rushed to shield the Kennedys moments after John F. Kennedy was shot in 1963, has died at 93.

Americans forfeit millions of paid days off every year. And many U.S. workers now take shorter, partial-week vacations. But even a mini-break can be good for your health.

Deconstruction is a growing approach to taking down homes that diverts waste from landfills, cuts carbon emissions and creates a circular economy for construction materials.

Federal employees across the government reported seeing similar messages. Experts say the messages may violate ethics laws meant to keep partisan politics out of day-to-day governing.

Georgia and Arizona, two Sunbelt states Donald Trump narrowly lost in 2020, are seen as crucial in 2024. Republicans there seek to turn MAGA enthusiasm into votes through unconventional campaigning.

Even for Israelis who support the ceasefire with Hamas, it's been hard to watch Palestinians convicted of involvement in mass shootings and suicide bombings walk free.