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Faulty forms of the brain protein tau trigger tangles inside and outside brain cells of Alzheimer's patients. Scientists say figuring out how to stop bad tau's spread from cell to cell might be key.

The book, titled Purity, promises an expansive sprawl and familiar themes, but also a few stylistic experiments. Meanwhile, Texas gears up for a hearing and final vote on much-debated textbooks.

When it comes to on-the-spot answers to simple historical and political questions, some people don't have a clue.

The kidnapping and killing of Westerners isn't a new phenomenon in the Middle East. But the last time around, it stopped after just a few years. This time there's no end in sight.

Soccer's governing body said assets may have been transferred to Switzerland in connection with the bids. Just days ago, FIFA cleared eventual winners Russia and Qatar of corruption.

The procedure to give people with single eyelids a crease above their lashes often provokes controversy. NPR's Kat Chow steps past the debate over whether people should do it to get at the why.

The cooking-kids show MasterChef Junior somehow combines high energy, endearing kids with really skilled cooking. The result is a very different kind of competition show.

The track star has won his share of races, but he often gets as much attention for what he does off the track as what he does on it.

Based in Iraq and Syria, the Islamic State is using its chameleon-like branding and financial incentives to attract extremist groups from Egypt's Sinai Peninsula to Libya's Mediterranean coast.

When a pregnant woman catches Ebola, the fetus and amniotic fluid are flooded with the virus. The ripple effects of these dangerous deliveries could be more catastrophic than Ebola itself.