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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.

Many farmers who grow corn and soybeans to feed livestock use too much nitrogen fertilizer, which can cause a host of environmental problems. To fix them, scientists say we should eat less meat.

Last week, at the FBI's request, a court ordered Apple to cooperate with federal agents and help unlock the iPhone of one of the San Bernardino shooters. The company says the demand is illegal.

A newly released report says some areas of the U.S. have recovered from the Great Recession much more than others.

Reframing addiction as a chronic illness would help people get appropriate treatment and benefit the health care system, says A. Thomas McLellan, co-founder of the Treatment Research Institute.

Once Trump's adversary in the presidential race, Christie said Friday "he is a successful person that, like me, isn't afraid to tell it like it is."

In a note to employees, Zuckerberg says replacing the slogan on walls on the Facebook campus with "all lives matter" is disrespectful, deeply hurtful and — given his earlier warning — also malicious.

About 40 percent of invertebrate pollinator species such as bees and butterflies are facing extinction, according to the global assessment.

U.N. chief Ban Ki-moon is urging both sides in the South Sudanese civil war to resolve their differences. In the meantime, some 2 million people are living in limbo in the brutalized nation.

So far, the U.S. territory has reported 117 Zika cases, including five pregnant women. But health officials say the real test will come when April and May rains bring more mosquitoes.