Dinosaur teeth have ancient air trapped inside of them

How Iran war has made the world more dangerous

WATCH: Trump pressed on convincing U.S that Iran deal is a victory

Newly renovated Reflecting Pool turns green

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😎 Happy Father's Day from Lou Loops! 😂 | Lyla in the Loop | PBS KIDS #Shorts

NATO says it has stepped up as U.S. reduces support

WATCH: Historic cathedral in Kyiv burns after Russian strikes

WATCH: Supreme Court loosens gun ban for some drug users

Key changes coming for Department of Education

Africa CDC: Ebola outbreak could become worst ever

WATCH: Obama Presidential Center holds grand opening event

Poll: Trump’s economic approval rating hits new low #shorts

UK announces social media ban for teens under 16

Georgia GOP lawmakers reject redistricting push

Serial killer Rex Heuermann gets life in prison sentence

Yum Brands to sell struggling Pizza Hut for $2.7 billion

How Iranians find new ways to resist in dark moments

WATCH: Tensions increase as 'true scale' of Ebola remains unknown

The storied history of WWI's segregated Harlem Hellfighters