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Scientific papers that claimed stem cells could be made in the laboratory simply by dipping regular cells in acid didn't hold up under scrutiny. Now the work is being retracted because of errors.

When it comes to living at extreme altitudes, Tibetans may have gotten a leg up from Denisovans, a species of archaic humans that lived about 50,000 years ago.

It's called chikungunya. And it causes severe joint pain that can last for months. A quarter of a million people have caught the virus in the Caribbean. So how big a problem will it be stateside?

In the city of Jericho in the West Bank, there's a new home that looks like it might be from another planet. But in fact, its designers took pains to use materials that were as local as possible.

There are 13 presidential libraries and soon there will be a 14th, for President Obama. Places vying for the prize stretch from Hawaii to New York. Chicago is so eager it's pitched multiple proposals.

Half of Americans say they've had a major stressful event in the past year, according to a poll by NPR, the Harvard School of Public Health and the Robert Wood Johnson Foundation. Here's how it hurts.

To create accountability and transparency, some raw milk producers are coming up with guidelines for testing and safety. But federal agencies say all raw milk is still risky to consume.

The Marines will be required to open ground combat jobs to women in 2016. Now more than 160 female Marines have volunteered for a grueling training course that will determine their readiness.

Lots of kids spend part of their vacation at summer school, but there is very little information about what works.

For a long while doctors thought that an egg's age relative to others explained why older women are more likely to produce eggs with genetic abnormalities. But a study finds that's not really true.