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Growing up in a hungry household in the first couple of years of life can hurt how well a child performs in school years later, according to a new study.

An estimated 13.1 million children live in homes with insufficient food, according to the most recent figures from the U.S. Department of Agriculture.

Cancer can be caused by tobacco smoke or by an inherited trait, but new research finds that most of the mutations that lead to cancer crop up naturally.

The authors of the study published Thursday poked a hornet's nest by suggesting that many cancers are unavoidable.

It was a meeting of nerds and sharks.

The self-described "biotech nerds" and "robotic nerds" were seven high school students from Washington, D.C. The eight teens who call themselves "sharks" and flew in from Ghana. "The shark is a big fish so it means you're big. Knowledgeable," explains Stephanie Obbo of Ghana, an aspiring medical doctor.

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STEVE INSKEEP, HOST:

In 2015, when researchers Anne Case and Angus Deaton discovered that death rates had been rising dramatically since 1999 among middle-aged white Americans, they weren't sure why people were dying younger, reversing decades of longer life expectancy.

Now the husband-and-wife economists say they have a better understanding of what's causing these "deaths of despair" by suicide, drugs and alcohol.

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