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Hip replacements in hundreds of thousands of people began to fail after what seemed like successful surgery. In some cases, people's bones became so weak, just walking could make them snap. Why?

A researcher had an idea about viruses that was wild. And it turned out to be true.

Mathilde Krim, who died this week, was a vocal pioneer in HIV treatment and research at a time when discrimination against people with AIDS in the U.S. was rampant, even in medical care.

If you've got hours stuck on an interstate or an airplane in your near future, this list — four hours of entertaining listening — is our gift to you.

The chairman of the board, former Alaska Gov. Tony Knowles, said in a letter that the Department of the Interior showed no interest in engaging with its members.

Abu Qader came to the U.S. from Afghanistan when he was a baby. He wants to use his technology know-how to help the women of his birthplace.

Research shows that 400 female blue orchard bees are as effective at pollinating almonds as the more than 10,000 bees in a honeybee hive. But they reproduce slowly and are prone to wandering.

Unlike humans, bird embryos don't have an oxygen pipeline from their mothers. They develop inside eggs in a nest. Skunk Bear's latest video explains why these pre-hatchlings don't suffocate.

The Trump administration added a question about U.S. citizenship status that could undermine the quality of 2020 census information. Dozens of states and cities are suing to get the question removed.

California Gov. Jerry Brown has been silent on President Donald Trump's call this week for National Guard troops to help protect the southern border with Mexico.