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Knowing where rates of prevalence are highest — and lowest — can lead to new strategies for treatment and prevention. The map focuses on sub-Saharan Africa, the epicenter of the epidemic.

Uber had a rocky debut on the stock market. Despite taking a relatively conservative approach to its share price, the company saw its stock go down immediately as trading began.

The actor and comedian reveals in his new memoir, Silver Screen Fiend, that he used to have a film addiction. Watching the first Star Wars prequel led to a realization that helped him kick the habit.

The president discussed issues ranging from normalization of relations with Cuba to Sony Pictures' decision to cancel release of the film 'The Interview' after a North Korean hack attack.

Parents who refuse to have their children vaccinated live near others who do the same, a study finds. That increases the risk that children will become infected, even if they've had their shots.

The grand jury was presented with hours of testimony and thousands of pages of documents. Their job was to decide if there was enough probable cause to bring charges against officer Darren Wilson.

With ear probes, infrared cameras and laser beams pointed at passengers' foreheads, airports around the world are trying to stop infected travelers before they board a plane.

As many as 400 firefighters, still mourning those lost, are now battling the massive Arizona wildfire. Since it began Friday, the Yarnell Hill Fire has grown to more than 8,000 acres, destroying an estimated 200 homes.

It's the Green Climate Fund. It was called out last week by President Trump, who said he would cut off U.S. "billions." What does it do, exactly, and what will be the impact of the cutback?

The new year brought more than just new resolutions. It also brought hundreds of new state laws Monday. Here are a few notables — from marijuana legalization to house calls from hair cutters.