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.

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.

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