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Researchers knew the HIV outbreak in the small town of Austin, Ind., was related to IV drug use. Mapping how the virus mutated over time revealed its path — and how it might have been stopped.

Sophisticated criminals prey on the poor, luring them with false promises of lucrative jobs before depriving them of their organs. The "kidney mafias" benefit from powerful political connections.

President Rouhani's re-election bid has hit a steep challenge from hard-liner Ebrahim Raisi. Though Ayatollah Khamenei will remain supreme leader, the choice still marks a crossroads. Here's a primer.

Nearly everybody who competed in Saturday's GOP primary election and Democratic caucus is claiming some form of victory - except for one candidate.

In Poland and Romania, some are happy to have new U.S. bases in light of recent Russian moves. But others say the most likely result will be heightened tensions with Moscow.

Twenty-one years ago, Garland — now nominated to the Supreme Court — supervised the investigation following the bombing that killed 168 people.

Stanford physicist Carl Wieman is on a quest to bury the big lecture in favor of evidence-based techniques. But it's not clear higher education is listening.

Small towns like Massena, N.Y., have been devastated by recent plant closures, and presidential candidates are blaming free trade agreements. Former factory workers admit they had a part to play too.

This year, 59 civilians have been killed and 280 injured as fighting continues in a 3-year-old war between Russian-backed separatists and government forces. Residents despair of ever seeing peace.

Almost 48 hours after violence engulfed Charlottesville, Va., President Trump called out white nationalist groups by name. He had been criticized for not doing so in his initial remarks on Saturday.