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Protein subunit vaccines work by injecting people with a tiny portion of a virus. In the case of the COVID-19 vaccine, that tiny portion is the spike protein that the coronavirus uses to enter cells.

The individual returned from South Africa on Nov. 22 and had mild symptoms. Cases have been found in more than 20 countries, less than a week after the worrying new variant was first identified.

The war of words between NATO and Russia over Ukraine is reaching another highpoint — with Russian troops massing at the Ukrainian border.

A new book Colorization: One Hundred Years of Black Films in a White World unpacks the lens through which Black characters have been seen. Will Haygood, the author, explores this using three movies.

The first case of the omicron variant has been identified in the United States. The case occurred in a traveler who recently returned to California from a trip to South Africa.

Major League Baseball's collective bargaining agreement expired at 11:59 p.m. ET Wednesday. Owners imposed a lockout, the league's first work stoppage since the 1990s.

Much is unknown about the omicron variant. Scientists are scrambling to gather information. But with the first case of omicron confirmed in the U.S., public health officials can't afford to be silent.

NPR's Mary Louise Kelly talks with writer Annaliese Griffin about her efforts to avoid buying anything new during the holidays.

Twitter users may no longer share private videos or images of others without permission. Critics say the broad policy gives the company too much control over what's deemed in the "public interest."

The Chinese operation is one of six networks blocked from Facebook and Instagram after spreading false information and harassing opponents.