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A handful of AIDS cases were first recognized in the U.S. at the beginning of the 1980s. By 1990, there was a pandemic. In 1997, more than 3 million people became newly infected with HIV. A multimedia chart lets you track the cases by country over time.

When the temperature rises in Afghanistan, so does the insurgency. Every summer the Taliban's tactics, targets and intensity are a little different. This year, IEDs are in season, attacks are up, and Afghan forces are suffering more casualties.

The President of Ghana unexpectedly died Tuesday, and Ghana's former Vice-President John Dramani Mahama has been sworn in as the country's new leader. The peaceful transition is in contrast to past coups and political problems. Host Michel Martin recently spoke to Dramani Mahama about the Ghana's turmoil, which he details in his new autobiography My First Coup D'Etat.

The revelation is one more in series of questionable NYPD surveillance after Sept. 11.

Law experts say the abuses by New York City Police have gone almost entirely unpunished. They calling for NYPD to take bold steps to address the problems.

The crops taking the worst hit from the current drought are the ones we feed to animals, like corn. Higher corn prices mean it can cost more to feed pigs and cattle than they will fetch at market, meaning higher meat prices for all.

Alison Klayman's documentary Ai Weiwei: Never Sorry shows the famous Chinese artist's struggle against authorities. Klayman spoke to NPR's Robert Siegel about her film as well as Ai's artwork and politics.

Prescription drug abuse has soared in the past decade, leading pharmaceutical companies to alter the recipes for their painkillers to thwart misuse. But communities fighting the growing problem see drug users switching to new medicines to get around the changes.

Mariel Zagunis, the two-time gold medalist in sabre, has been named the U.S. flagbearer for Friday's Opening Ceremony of the London 2012 Olympics. Zagunis, who was chosen by her peers for the honor, will be the first fencer to carry the flag since 1968.

When Oregon couldn't pay for everyone eligible for Medicaid to be covered, the state resorted to a lottery. Researchers then compared the health of people who won coverage with those who didn't. The results show that Medicaid improves people's health.