The national security adviser raised the issue of more penalties in the poisoning of Aleksei A. Navalny days after President Biden met with President Vladimir V. Putin of Russia.

A conservative leader who fought corruption and pushed for economic progress, Mr. Bolaños believed that his country was in a time of crisis.

The setbacks come at a harrowing moment for Afghanistan, just as American and international troops are set to leave the country in coming weeks.

Jürgen Conings, 46, disappeared after threatening the government and virologists responsible for the country’s pandemic response.

Scientists generally recommend against antibody testing after vaccination. But for some people, it makes sense.

Mr. Bercow was a lawmaker with the governing Conservatives before being elected speaker, a role in which he irked the governments of both Theresa May and Boris Johnson.

Some independent shops flout the new limits on free expression. Others try to come to terms with them. For readers, they offer a sense of connection in a changed city.

Talk of ‘gain-of-function’ research, a muddy category at best, brings up deep questions about how scientists should study viruses and other pathogens.

The Irish entertainer is known for his freewheeling talk show, but in his novel “Home Stretch” he explores what it’s like for a gay man to return to his home and find both it and himself wholly transformed.

Talk of ‘gain-of-function’ research, a muddy category at best, brings up deep questions about how scientists should study viruses and other pathogens.