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Dolly, the first cloned mammal, had early arthritis and died young, raising concerns that clones age prematurely. But a study confirms the sheep's four sister clones are healthy and aging well.

You can't follow everything in Rio, but you want to catch the highlights. Here's a guide to the American athletes and events likely to produce the most memorable performances.

As leaked emails from the Democratic National Committee rock that party's convention this week, federal law enforcement officials are investigating the hack and whether it was orchestrated by Russia.

Journalists, dissidents, human rights workers all tell stories of being followed and harassed by Russia's security services. They range from the comical to the frightening.

After weeks at sea, Dario Schwörer and his family were grateful to have landed in Unalaska again. “We were so happy when we saw the Aleutians coming out…

Verizon's purchase of Yahoo will close the book on one of the oldest Internet companies. What happened to the other famous '90s brands, like GeoCities, Netscape and CompuServe? A nerdy remembrance.

What evidence ties Russia's intelligence services to the theft and release of the internal emails of Democratic Party officials? And how would the public release those messages serve Moscow?

Donald Trump and top advisers have business ties with Russia and its leaders going back many years. Moscow has a distinct point of view about the U.S. presidential election and cause to support Trump.

Britain's decision has repercussions for Ireland and the future of the border between the Irish Republic, an EU member state, and Northern Ireland, which is part of the United Kingdom.

NPR's Kelly McEvers talks with Dr. Samer Attar, a Chicago surgeon who recently returned from a volunteer stint at a hospital in Aleppo.