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Since da Vinci's death, no three-dimensional work of art by him has ever been identified. That is, until now, say curators in Italy.

An Ebola treatment center in the Democratic Republic of Congo has been attacked for a second time in the past month, as the country deals with one of the largest outbreaks of the epidemic in history.

Twitter is developing a feature aimed at making the site less toxic for users. NPR's Michel Martin speaks with Amnesty International's Rasha Abdul-Rahim, who has studied harassment on Twitter.

There was major drama in the reality TV world when Bachelor star Colton Underwood stormed off set and hopped over a fence. These surprise moments give long-running reality shows staying power.

A huge, centuries-old ceiba tree on the Puerto Rican island of Vieques has bloomed again for the first time since Hurricanes Maria and Irma struck. Residents see this as a sign of hope.

Getting DNA into plant cells is tricky. Researchers have tried using infectious bacteria, as well as gene guns that shoot gold bullets. Then a physicist came up with a new approach almost by accident.

The Trump administration wants to allocate more of California's water to farmers. Internal government emails show concern that the change is being pushed too fast for adequate scientific review.

Maybe it's just because a large number of older people have learned the benefits of exercise and canine companionship. Whatever the reason, walking a dog on a leash has been linked to more fractures.

One of the last human rights workers in the Russian republic of Chechnya is on trial for drug possession. His lawyers say the charges are intended to stop him from reporting human rights violations.

Steve Inskeep talks to Democratic Rep. Scott Peters of California, a member of the House Committee on the Budget, about what the Trump administration calls a "tough" budget for the 2020 fiscal year.