In a week marked by controversy, two US states executed four convicted murderers, reigniting the debate over capital ...

Astronomers have detected oxygen in the most distant galaxy ever found. It’s 13.4 billion light-years away from Earth, according to new research.

U.S. natural gas futures rose for a second straight session as weather forecasts added back some cold for the remainder of March.

Nitrogen gas had only been used in death row executions four times before Jessie Hoffman Jr. was executed in Louisiana on ...

The term greenhouse gas often brings carbon dioxide (CO2) to mind, and rightly so, as it is a key contributor to rising ...

Louisiana used nitrogen gas to put a man to death Tuesday evening for a killing decades ago, marking the first time the state ...

The US state of Louisiana has used nitrogen gas to put a man to death for a murder committed decades ago, marking the first ...

Nitrogen gas execution, also called nitrogen hypoxia, is rare in the US This was only the fifth time the method had been used ...

Convicted rapist and murderer Jessie Hoffman became the first death row inmate in Louisiana, and only the fifth in the United ...

Louisiana carried out its first execution using nitrogen gas on Tuesday evening, marking the state’s return to capital ...