Dinosaur teeth have ancient air trapped inside of them

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

Africa CDC: Ebola outbreak could become worst ever

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Newly renovated Reflecting Pool turns green

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War in Ukraine officially longer than World War I

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Key changes coming for Department of Education

Anti-immigrant protests in Northern Ireland turn violent

UK announces social media ban for teens under 16

Yum Brands to sell struggling Pizza Hut for $2.7 billion

Georgia GOP lawmakers reject redistricting push

WATCH: Historic cathedral in Kyiv burns after Russian strikes

WATCH: Supreme Court loosens gun ban for some drug users

Serial killer Rex Heuermann gets life in prison sentence

How Iranians find new ways to resist in dark moments

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