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A group of high school math geeks gathered in Manhattan last week for March Mathness. Their hope is to use math to pick the winners for all 67 NCCA games and win $1 billion from Warren Buffett.

President Obama says the U.S. will not recognize Crimea's moves to split from Ukraine. In Moscow, President Vladimir Putin signs an order recognizing Crimea as an independent state.

David Greene talks to NPR's Michele Kelemen about the new sanctions imposed on Russian officials by the United States and European Union.

The Morning Glory was seized earlier this month by three armed Libyans. A Pentagon statement said the SEALs took control of the vessel after an operation Sunday. No one was injured.

Researchers say they have found direct evidence of a mysterious and ultrarapid expansion of the universe in the first sliver of a second after the Big Bang.

An Army general accused of sexually assaulting a subordinate has pleaded guilty to lesser charges. The case against him collapsed under doubts about the accuser's credibility.

The Ukrainian parliament has voted to mobilize 40,000 reservists as Kiev tries to beef up its military following the referendum in Crimea.

Western lawmakers and Interior Secretary Sally Jewell urge changes to the way America pays to fight wildfires, starting with preserving money that's meant for fire prevention.

Screening for colon cancer actually prevents the disease, but one-third of people over 50 have never been screened. A new campaign hopes to get 80 percent of eligible people screened by 2018.

Silicon Valley companies have launched a drive to provide citizenship services on-site to employees holding green cards. The belief is that such employees become more valuable workers.