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The largest-ever prime number has been discovered at the University of Central Missouri. It breaks the previous record by almost 5 million digits.

Bernie Sanders and Hillary Clinton are locked in a tighter race than Clinton could have imagined months ago. Now, Clinton and her allies are criticizing Sanders' preparedness to be president.

It fits in your hand, can connect to Wi-Fi and has Bluetooth. The $9 CHIP promises to be a teaching tool that's also fun to play with. It's just one of several low-cost computers hitting the market.

Hillary Clinton has been feeling the heat from her Democratic challengers. Senator Bernie Sanders this week criticized Clinton — saying she may have experience but doesn't have the right judgment.

Dozens of black religious leaders boycotted Mayor Rahm Emanuel's Martin Luther King Jr. breakfast. David Greene talks to Chicago pastor Corey Brooks about the mayor's handling of police violence.

An investigation into the killing in Britain of Alexander Litvinenko puts the blame on the Russian government. The British report says President Vladimir Putin likely approved the assassination.

Every campaign has volunteers who passionately support their candidate for president. Some of them have unique stories — like the couple who moved from Hawaii to Iowa to participate in the caucuses.

Smith's NFL career began in 2003 with the New York Jets. She is now the quality control-special teams coach for the Buffalo Bills.

Widow Marina Litvinenko says, "The words my husband spoke on his deathbed, when he accused Mr. Putin of his murder, have been proved true in an English court."

Talk of peace between the parties, as Hillary Clinton described in an NPR interview, will not appeal to everyone in this year of the angry activist. But Clinton hopes to survive the primaries.