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Some patients who have had COVID-19 develop symptoms resembling early Alzheimer's. Researchers are trying to figure out whether these people are more likely to develop the disease itself.

When a U.S. beach volleyball player tested positive for coronavirus, his teammate needed to find another partner before their first Olympic match. So far, it's working.

The elements of the bouquet carry a deeper story, and they are years in the making. They're meant to symbolize the country rising from the devastating earthquake and tsunami in 2011.

Parents across the country are weighing whether to send their children to in-person school this fall. Some districts are getting creative in an effort to win them back.

The law requires a special pass to enter restaurants, trains, planes and other public venues. To get the pass, people must have proof they are vaccinated, tested negative or recovered from the virus.

The U.N. warns that without a major de-escalation in violence, Afghanistan is on course to have the highest ever number of documented civilian casualties in a single year since record-keeping began.

Hundreds of scientists are meeting to finalize a landmark climate report. It's meant to guide the next decade of international climate policy, but it's unclear if politicians will act on it.

Australia's Ariarne Titmus narrowly edged her out of gold in the 400 meter freestyle final. Ledecky, the biggest star of U.S. swimming, has a fierce rivalry with Titmus.

Scores of mothers competing in the Olympics and Paralympics are speaking out about the challenges they face as working mothers in sports. Some are using their platform to make a change.

18-year-old Ahmed Hafnaoui seemed stunned by the result. "I just can't accept that — it is too incredible," he said after his victory in the 400 meter freestyle event.