Rhitu Chatterjee

As more states legalize marijuana, more people in the U.S. are buying and using weed — and the kind of weed they can buy has become much stronger.

That concerns scientists who study marijuana and its effects on the body, as well as emergency room doctors who say they're starting to see more patients who come into the ER with weed-associated issues.

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The father of a Sandy Hook shooting victim was found dead this morning in Newtown, Conn., in an apparent suicide.

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The rate of premature birth across the United States rose for the third year in a row, according to the annual premature birth report card from March of Dimes, a nonprofit organization that works to improve maternal and infant health. This comes after nearly a decade of decline from 2007 to 2015.

In 2017, the premature birth rate was 9.93 percent of births, up slightly from 2016, when it was 9.85 percent. The report card draws from the latest Centers for Disease Control and Prevention data.

The number of people dying by suicide in the United States has risen by about 30 percent in the past two decades. And while the majority of suicide-related deaths today are among boys and men, a study published Thursday by the National Center for Health Statistics finds that the number of girls and women taking their own lives is rising.

Loneliness isn't just a fleeting feeling, leaving us sad for a few hours to a few days. Research in recent years suggests that for many people, loneliness is more like a chronic ache, affecting their daily lives and sense of well-being.

Now a nationwide survey by the health insurer Cigna underscores that. It finds that loneliness is widespread in America, with nearly 50 percent of respondents reporting that they feel alone or left out always or sometimes.

Our ancestors in Kenya's Southern Rift Valley made some pretty innovative tools. And they made them far earlier than previously thought.

The oldest innovations were axes designed to be held in the palm of the hand. They were shaped like a tear drop, with a rounded end and a pointed eye. The edges were wavy and sharp. And they look as if they were great at chopping down branches — or chopping up the carcass of a large animal.

Back in October 2017, women took to social media to share their experiences of sexual harassment. The #MeToo movement went viral, spurring a national and global discussion on the issue.

Many women have since come forward with their experiences of being sexually harassed by colleagues and bosses, costing influential men in the entertainment industry and the media — including journalists here at NPR — their jobs.

Scientists measuring levels of air pollutants in the Los Angeles basin have found that everyday household products, like soaps, paints and perfumes are causing nearly as much air pollution as cars and industries combined.

Archaeologists in Israel have discovered the oldest fossil of a modern human outside Africa. The fossil suggests that humans first migrated out of the continent much earlier than previously believed.