Merrit Kennedy

This frog really lights up a room.

The South American polka dot tree frog initially appears unremarkable. But researchers in Argentina recently got a huge surprise when they shone an ultraviolet light on it, revealing that the creature is actually fluorescent and glows bright blue-green.

Updated at 2:40 p.m. ET

The Justice Department has announced charges against four people, including two Russian security officials, over cybercrimes linked to a massive hack of millions of Yahoo user accounts.

The top U.S. Marine vowed in a Senate hearing to hold members of the Marine Corps accountable for sharing nude photos of female Marines online. But many members of the Senate Armed Services Committee responded with tough questions Tuesday, asking why more isn't being done to protect female service members.

Scientists have caught sight of a star extremely close to what they think is a black hole, whizzing around it at an extraordinary speed — at least twice an hour. As NASA put it, "This may be the tightest orbital dance ever witnessed for a likely black hole and a companion star."

The pair is in our galaxy, in an area dense with stars some 14,800 light-years from Earth.

Joni Sledge of the group Sister Sledge, best known for the iconic disco 1979 anthem We Are Family, has died at 60.

The group's publicist, Biff Warren, said Sledge was found at home in Arizona and they have yet to determine a cause of death. She had not been ill, he said.

An iconic Maltese natural rock arch collapsed into the sea Wednesday during a powerful storm.

The "Azure Window" jutting off Malta's Gozo Island is printed on innumerable Instagram posts and travel brochures. It was also featured in movies and TV shows, including HBO's Game of Thrones.

Lynne Stewart, a leftist lawyer who defended radicals and was eventually convicted in a terrorism case herself, has died at 77.

Her son Geoffrey Stewart told NPR that Stewart died Tuesday. She was released from prison in 2014 because she suffered from terminal cancer.

Stewart, who defended Black Panthers and Weather Underground members over the course of her career and considered herself a "people's lawyer," is perhaps best known for representing Egyptian cleric Omar Abdel Rahman in his trial over plotting to attack New York City landmarks.

Brazil's recession was already of historic proportions. Today, government figures confirm that it has grown even worse.

The economy last year actually dipped more sharply than expected. The national gross domestic product contracted by 3.6 percent in 2016, statistics agency IBGE said Tuesday.

Israel has passed a new law that allows it to bar entry to foreign activists who support a boycott of the country.

The law takes aim at the BDS movement, which emerged more than a decade ago and is an acronym for "boycott, divest and sanction." The BDS movement aims to put economic pressure on Israel in support of Palestinian independence.

Would-be visitors "who support a boycott of Israel or who represent an organization that publicly calls for a boycott" may be banned, as NPR's Daniel Estrin reports from Jerusalem. Here's more from Daniel:

Poachers forced their way into a French zoo and killed a southern white rhinoceros named Vince, sawing off one of his horns before fleeing into the night.

The Thoiry Zoo said police are investigating the killing of the 4-year-old animal. The poachers remain at large.

Tossing a coin into a pool is believed to be good luck. But it proved to be terrible luck for a green sea turtle who consumed nearly 1,000 coins thrown into her pool.

The female green sea turtle is now recovering from an hours-long surgery on Monday. Veterinarians removed some 11 pounds of metal that she couldn't digest, according to The Associated Press.

After Germany canceled a political rally featuring a Turkish minister, Turkish President Recep Tayyip Erdogan likened the German government to the Nazis.

The comments mark a "new low in German-Turkish relations," NPR's Soraya Sarhaddi Nelson reports from Berlin. German officials condemned the inflammatory remarks but "stopped short of punitive actions against Ankara over the matter," Soraya says. "That's because Germany desperately needs Turkey's help to keep asylum seekers from flooding into Europe."

Updated 8:30 p.m. ET

Federal authorities have arrested and charged a man in St. Louis who they say is responsible for making at least eight threats against Jewish schools and organizations across the U.S.

The threats were allegedly part of the suspect's larger cyberstalking campaign against a woman with whom he once had a romantic relationship, the U.S. Attorney's Office for the Southern District of New York said.

It was once called the "trial of the century" in Egyptian media.

And now, the final ruling has come down from Egypt's top appeals court: Longtime dictator Hosni Mubarak has been acquitted of ordering police to kill anti-government protesters during the uprising that ousted him in 2011.

This marks the end of a six-year court battle, during which the political landscape in Egypt has shifted dramatically. Many of the protesters who led the 2011 uprising sit in prison, while many figures associated with the Mubarak regime have re-entered political life.

Nearly a week after Malaysia concluded that the half-brother of North Korean leader Kim Jong Un died of poisoning from a powerful nerve agent, North Korea is claiming that he probably died of a heart attack.

Ri Tong Il, who once served as the North Korean deputy ambassador to the United Nations, told reporters Thursday that the man "probably died of a heart attack because he suffered from heart disease, diabetes and high blood pressure," according to The Associated Press.

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