DEF stands for diesel exhaust fluid, and it is mandatory for all semi-trucks to use it in the United States. Here's why and ...

Four US soldiers and a tank vanished while on a training mission in Lithuania as a major search operation was launched. NATO Secretary General Mark Rutte later confirmed they had died. Lithuanian ...

He went from Def Jam to a Mets jam. The legendary Def Jam graphic artist who created the cover of Biggie Small’s “Ready to Die” has been reimagining the Mets’ logo in a colossal collage he ...

Maya Mehrara is a News Reporter at Newsweek based in London, U.K.. Her focus is reporting on international news. She has covered Ukraine, Russia, immigration issues, and the revolution in Iran.

The tactic helps Kyiv make sure that damaged Russian tanks can't be fixed up for battle again. BI visited one of the companies that produces this ammunition in Kyiv. KYIV, Ukraine — The war in ...

It's also lighter than the current B6.7 diesel. Going gas means you can ditch diesel exhaust fluid (DEF) tanks and emissions equipment while enjoying diesel-like maintenance intervals—Cummins figures ...