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If you want to socialize with family or friends — say share a vacation cabin — can testing in advance keep everyone safe? We asked experts how diagnostic tests work and how to interpret the results.

President Trump says there could be widespread distribution of a vaccine against the coronavirus in a much shorter timeline than described by the CDC.

The talks showed deep divisions, as small countries highly vulnerable to rising seas and powerful storms were at odds with wealthy, high-emitting countries like the United States.

In Afghanistan, Ralph "AK" Angkiangco was a medic with a Marine platoon that suffered terrible casualties. For years, the holiday was a time to drink and forget, not remember. This year is different.

Some cases of the novel coronavirus are asymptomatic, presymptomatic or mildly symptomatic. Scientists are trying to determine their role in transmission of the disease.

Researchers are trying to learn more about COVID-19 vaccines from original study participants. The quest is hampered because many people who first received a placebo shot are opting for the vaccine.

A man stabbed people celebrating Hanukkah at the home of a rabbi in Rockland County, a New York City suburb, on Saturday night. The incident comes amid a surge of anti-Semitic violence in the region.

The vice president, who chairs the White House coronavirus task force, is the most high-profile U.S. official so far to receive the vaccine.

It's easy to make fun of disgruntled teenagers, but in his funny new Nietzsche and the Burbs, author Lars Iyer depicts them accurately and with real sensitivity, never mocking or condescending.

Along some coastlines toxic contamination could seep into basements or broken sewage lines in coming years. In California's Bay Area, regulators are grappling with how to protect people.