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British Prime Minister Boris Johnson praised his top aide who is accused of violating quarantine rules by leaving London and driving to northern England while he was infected with COVID-19.

Just minutes after Joe Biden announced Sen. Kamala Harris will be his running mate, President Trump tweeted out his campaign's first ad targeting Harris.

New York’s junior senator, Kirsten Gillibrand, was officially nominated for re-election Friday at a meeting of the State Democratic Party in Albany,...

Iowa voters began gathering for the start of the caucuses Monday night. NPR reports from a Republican caucus site in Urbandale, Iowa.

The robot designed by a team from Harvard University moves without the help of any rigid parts. Researchers say it is the first proof-of-concept design for an entirely soft, autonomous machine.

California's top election official has announced that organizers of a campaign to recall Gov. Gavin Newsom have submitted enough valid signatures to place the question before voters later this year.

In Turkey, the government is touting its donations of medical supplies abroad even though coronavirus is taking a steep toll in Turkey and the economy is on the brink.

NPR's David Kestenbaum reports on a possible wrinkle in the space-time continuum. Really. Physicists measuring the fundamental characteristics of a subatomic particle, the muon, have come up with some very puzzling results that could punch a hole in the long-standing "standard model" of how matter is put together. And that could help usher in a completely new theory of matter, time and space. Unless, of course, some scientist has made a mistake. (4:30) (It was later revealed this was a mistake: "Well, I would say I'm responsible for the mistake. My collaborator did most of the work, but I am equally guilty of making mistakes." Toichiro Kinoshita, a physicist at Princeton University. Kinoshita's sin was to have a minus sign where he should have had a plus or maybe the other way around. He can't quite remember, though it ended up having gigantic consequences. Kinoshita and his colleague were calculating how a particular subatomic particle behaves when it's stuck in a magnetic field. The particle, it turns out, wobbles like a toy top at a particular frequency. Kinoshita enlisted hundreds of computers and, after a decade of heroic work, had precisely predicted how fast it should wobble according to the laws of physics. Last winter, other physicists who were out measuring the wobble found it differed significantly from Kinoshita's prediction. In the clockwork world of physics, this was potentially a huge finding, signaling something new and mysterious, except that it wasn't. Kinoshita traced his error to a tiny quirk in a computer program he was using. He hadn't checked that bit, in part because other physicists using a different approach had gotten the same answer."

Facing a declining birthrate, China will allow married couples to have up to three children. This raises the previous ceiling of two children.

People living near the Susquehanna River in Wilkes-Barre, Penn., are returning to their homes as river waters recede. But flooding still threatens other communities in Pennsylvania, New Jersey and other parts of the Northeast.