Dinosaur teeth have ancient air trapped inside of them

The storied history of WWI's segregated Harlem Hellfighters

With Putin's power challenged, who could replace him?

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

Africa CDC: Ebola outbreak could become worst ever

Newly renovated Reflecting Pool turns green

D.W.'s Iconic Pool Moment 😅 | Arthur | PBS KIDS #Shorts

😎 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

Interfaith group considers religion in America's founding

How Iranians find new ways to resist in dark moments

Massive fire rips through Los Angeles warehouse

Key changes coming for Department of Education

Who is the only woman to receive the Medal of Honor?

🎉 Happy Father's Day from PBS KIDS! ✨ #Shorts

WATCH: Historic cathedral in Kyiv burns after Russian strikes

WATCH: Supreme Court loosens gun ban for some drug users

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

Slavery is both “nowhere” and “everywhere” in the Constitution

How Trump influences Israeli opinion, elections