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HIV rates in the U.S. have been dropping for about a decade. But African-American and Latino men who have sex with men still face a very high risk of becoming infected. Stigma is one big reason.

Protests around the Academy Awards' trouble with racial representation feel like a fresh, contemporary controversy, but they go back almost a half-century.

U.S. health officials say they have confirmed the two women had Zika. And their only risk factor was having slept with male partners who had recently traveled to places with active virus transmission.

Fewer people are having strokes now than decades ago. But that improvement seems to be mostly among the elderly. Young people are actually having more strokes, partly because of the rise in obesity.

A report from doctors in Argentina raises the possibility that a mosquito pesticide could be responsible for an increase in microcephaly in Brazil. But many top scientists strongly disagree.

The Reuben H. Fleet Science Center announced Thursday it will take over the flagship programs of a science education nonprofit that's ceasing operations at the end of this month.

In rare but tricky cases, disposing of an explosive device requires removing it safely from a living person. Military doctors have ways to minimize the risks, but there's no way to eliminate them.

Women report more bad side effects from medicines than men do. Researchers say the discrepancy may stem in part from how biomedical research is conducted at its earliest stages in animals.

For decades, Zika was considered a mild virus that rarely made people ill. Suddenly it seems to be causing serious problems and is spreading across the Americas. Here's the latest news.

The warning is believed to be the first of its kind for the continental U.S. from the Centers for Disease Control and Prevention. Read about this update and see a full timeline of the Zika outbreak.