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Mathematical modeling suggests that the mutations in this variant make the virus more transmissible. What does that mean for preventive measures — and the new vaccines?

Problems included a glitch with a sign-up app and some staff jumping to the front of the line ahead of medical workers with more exposure to the coronavirus.

From Medicare to Obamacare to controlling drug costs, the candidates mostly differ in their approach to health care. Here's a quick guide to their views and proposals.

He is getting outspent on advertising by his Democratic challenger Joe Biden. But the president's campaign says in-person events, rallies and outreach are making up the difference.

Camp Century was a research station and test site for deploying nuclear missiles before it was abandoned under the ice in the '60s. Scientists say pollutants left behind may spread as the ice melts.

Searching for alien life is harder than you might think, because whatever is out there might be really odd. So leading astrobiologists are meeting to advise NASA on how to go about looking for it.

The mission aims to circle a hill-sized asteroid for two years, then skim its surface and bring a hearty sample of 4.5 billion-year-old dirt back to Earth.

The current surge in cases can be contained, says White House advisor Anthony Fauci. But it's going to take a real focus on social distancing — and mask wearing.

As cities weather the first blasts of excessive summer heat, officials weigh the benefits of opening cooling centers and spray parks against the risks of letting people gather in public spaces.

One of the most drastic steps was a decision to adopt all new paper-backed voting machines before November after deciding that the paperless electronic equipment was vulnerable to attack.