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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.

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.

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.

Hillary Clinton will break the penultimate glass ceiling this week — becoming the first female nominee of a major American political party. Here are some things to watch at the Democratic convention.

Hillary Clinton is making history as the first female nominee of a major U.S. political party. But for many this milestone doesn't feel like a big deal, in part because of her long experience.

The NBA will move the 2017 All-Star Game over a controversial North Carolina law that affects LGBT people. John Amaechi, the first pro basketball player to come out as gay, talks about the move.

While Yahoo will keep its most valuable assets, the $4.8-billion sale effectively disbands Yahoo as one of the longest-running Internet companies.

The National Retail Federation predicts this year's back-to-school spending will shoot up. With a fall in gas prices, and lower inflation and interest rates, economists say Americans have extra cash.

A cardiologist knows how to game the system to get his patients bumped up the list for a heart transplant by giving them care they don't need. Is that being a good doctor — or a moral failure?