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The conventional wisdom is that it takes 15 minutes of close contact to a contagious person to put you at risk. But even a short exposure could prove problematic.

Since the conventions, Donald Trump has stumbled badly. That has moved voters in the direction of Hillary Clinton, giving her a sizable lead in the key states.

Projections of deaths from COVID-19 vary wildly. How are we to make sense of the differences? One researcher has developed one model that compares and merges them all.

Girls in the U.S. are getting their first menstrual period about 6 months earlier on average than they did in the 1950s and '60s. And the number of girls starting their period before age nine has doubled. Researchers say parents can help prepare their kids for early puberty.

The brief declaration of martial law in South Korea last month has drawn comparisons to the Jan. 6, 2021, attack on the U.S. Capitol. The attempted power grabs could hold lessons for other democracies.

Flags like some of those carried by January 6th rioters have been spotted flying outside homes belonging to Supreme Court Justice Samuel Alito, raising concerns among judicial watchdogs.

Minority Leader Kevin McCarthy did not take the robust action Democrats and some Republicans were calling for, so the whole chamber took up a resolution on her racist and inflammatory comments.

In a stunning turn of events, David Crawford, a law enforcement veteran, is now under arrest and facing dozens of charges in connection to at least 12 fires at homes, garages and cars.

Social media took a lot of blame for intensifying polarization and partisan acrimony during the presidential campaign. Now some startups and researchers are trying to burst ideological filter bubbles.

Trolls, bots and other mischief aimed at shaping the U.S. information environment have continued long after the presidential election even as Washington focuses on Facebook and Twitter.