Unusual opioids are infiltrating street drugs. Knoxville’s top forensic doctor is on the front lines, pressing to quickly identify the most lethal.

A flaming crater of gas has burned in Turkmenistan for decades. Satellite imagery suggests that the fires are decreasing, but the environmental implications are unclear.

Lee Chun Ho lost four members of his household in last November’s apartment-tower blaze. He’s now telling an investigative committee what contractors ignored.

Some see a clear explanation: Russia needs more troops, and young men in Africa desperately need jobs.

What to know about this year’s celebration, including the return of a superstar last seen on the Met carpet 10 years ago.

Cellphone bans got devices out of students’ hands, according to the first large study. But behavior and academics have not improved, at least so far.

Having gotten into trouble for making jokes critical of the Chinese government, the standup comic Chizi now lives in self-imposed exile. He’s finding that freedom imposes its own constraints.

A growing number of men across the continent say they are being promised jobs in Russia, only to be forced into the war. Some go as mercenaries, but many more are drawn unwittingly.

The teenagers, who had faced deportation after a high-profile detention, took the stage on Sunday thanks to an invitation from one of country music’s biggest stars.

President Trump offered few details on how the new program, which he called Project Freedom, would work, but said interference would be dealt with “forcefully.”

One case of hantavirus infection has been confirmed in a laboratory, the organization said on Sunday. There are five additional suspected cases.

With President Trump’s visit to Beijing looming, China is pushing Iran to negotiate even as its companies export material that could be used by Iran’s military.

A spokesman for the former mayor of New York City said Mr. Giuliani was critical but stable.

Three people aboard a cruise ship sailing the Atlantic Ocean have died from what health officials suspect were hantavirus infections.

The conspiracy theories around the Butler, Pa., assassination attempt hurt Helen Comperatore, but in this age of distrust, partisanship and social media, she nurtures a conspiracy theory of her own.