Article 4 allows member states to start a formal discussion within the alliance about threats to their security. It does not commit the alliance to military action.
Troops imposed order after at least 22 people were killed during antigovernment demonstrations. Members of the Gen Z protest movement said they wanted a former Supreme Court chief justice to lead a new interim government.
Ten years ago, astronomers made an epic discovery with the Laser Interferometer Gravitational-Wave Observatory. Cosmology hasn't been the same since, and it might not stay that way much longer.
Balendra Shah won an upset victory three years ago to become Kathmandu's mayor. He's using social media to coach protesters on the country's next steps.
Legislators voted down a proposal that would have given some rights to couples who married overseas. Campaign groups urged the government to try again.
Poland denounced what it has described as an incursion by more than a dozen Russian drones. It would not be the first time Russia's war effort had spilled beyond Ukraine.