Plants need carbon dioxide to live. But its effects on them are complicated.

As the level of carbon dioxide in the air continues to rise because of climate change, scientists are trying to pin down how the plants we eat are being impacted.

Mounting evidence suggests that many key plants lose nutritional value at higher CO2 levels, and scientists are running experiments all over the world to try to tease out the effects.

For most of her childhood, growing up in southeastern Pennsylvania, Kelly Zimmerman felt alone and anxious.

She despaired when her mother was depressed or working late shifts; when her parents fought nonstop; when her friends wanted to come over, and she felt too ashamed to let them see her home's buckling floor, the lack of running water.

Kelly tried to shut out those feelings, and when she was 18, a boyfriend offered her an opioid painkiller — Percocet.

Her anxiety dissolved, at least for a little while.

Our Take A Number series is exploring problems around the world through the lens of a single number.

Some high school students think of applying to colleges as a full-time job. There are essays and tests, loads of financial documents to assemble and calculations to make. After all that comes a big decision — one of the biggest of their young lives.

For top students who come from low-income families, the challenge is particularly difficult.

North Korean Leader Kim Jong Un Visits China

6 hours ago

North Korean leader Kim Jong Un arrived Tuesday in Beijing where he will spend two days, according to Chinese state media.

Xinhua announced his visit after reports of an Air Koryo flight, the North Korean state-run airline, was due to land in the Chinese capital. Kim's previous travels to China were not announced or publicized until after he had left, and the visit had concluded. This is Kim's second plane ride to China, according to NPR's Anthony Kuhn. Previously Kim had also traveled to China via armored-train.

More than 115 Americans are dying every day from an opioid overdose. But a study out Monday finds that just three in 10 patients revived by an EMT or in an emergency room received the follow-up medication known to avoid another life-threatening event.

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