Louisiana plans to use nitrogen gas to execute death row inmate Jessie Hoffman next week. Here's what to know about the ...

The aurora borealis lit up the night sky in Michigan on Monday and Tuesday, according to the NOAA's Space Weather Prediction Center. Here's a look at what people shared online: The northern lights are ...

Imagine if Earth's history had a mystery novel, and one of its biggest unsolved puzzles was: Where did all the nitrogen go?