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President Obama goes to The Hague for a nuclear security summit Monday. Although the crisis in Ukraine is overshadowing the event, there is a packed agenda independent of the tensions with Russia. This is the third time world leaders have met to discuss how to keep nuclear materials out of terrorists' hands.

To celebrate its eighth birthday, Twitter has put out a tool that lets you see any user's very first tweet. Some were naturals. Others might cringe at their first contribution.

Brian Crecente, who is covering the Game Developers Conference this week for the video game website Polygon, talks about the latest trends in the industry.

Also: As Ukraine moves closer to EU, Putin signs law to annex Crimea; Mt. Gox says it found 200,000 Bitcoins; and a "day of upsets" in college basketball.

Former Deputy Secretary of State Strobe Talbott and former National Security Advisor Stephen Hadley tell NPR that the U.S. and EU must stick together on sanctions.

Europe has been trying to reduce its energy dependence on Russia for years. The crisis in Crimea has given the effort a greater sense of urgency.

A new study shows that black students are far more likely to be suspended or expelled from school — and that gap begins before grade school.

President Obama met Friday with executives from several high-profile tech companies worried over government surveillance practices, a topic that scrambles the usual political landscape.

The U.S.-based credit card companies responded to sanctions imposed on Moscow in the wake of its annexation of Crimea.

Images taken four days ago by a Chinese satellite show something large floating in the same general area of the Indian Ocean as in earlier pictures. But searchers didn't find anything Saturday.