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To many parasitic worms, we are the world. And the way they've evolved to live within us — without wiping us out — is stunning.

Earlier this year, a pair of scientists predicted the existence of a ninth planet based on computer modeling of the solar system. This fall, the race is on to be the first to spot it in a telescope.

At a party for Syrian refugees in a New Jersey mosque, Americans of Lebanese and Pakistani descent and a Jewish family offer help and stories of their own immigrant backgrounds.

Next time you're planning a vacation, it might be wise to enlist the help of a child. NPR's Scott Simon speaks with Leo Kugel, who did just that.

Even tiny amounts of lead in the water can cause IQ deficits in children or high blood pressure in adults.

Vanita Gupta, the head of the Department of Justice Civil Rights Division talks about the federal government's findings that Baltimore policing techniques have showed racial bias.

Do you know how long the longest earthworm is? Or how people might contract a parasitic worm?

One athlete's "psych-up" ritual may psych out an opponent. And even treatments that lack hard evidence of benefit, scientists say, might provide a competitive edge if the athletes believe they work.

Hours after an officer shot and killed an armed suspect who ran from police during a traffic stop, protests turned violent. Mayor Tom Barrett plans to meet with community and religious leaders today.

Zeinab al-Ashry founded the popular Facebook group, "Confessions of a Married Woman." University of California Riverside professor Sherine Hafez talks to Rachel Martin about an online trend in Egypt.