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The bills in your wallet have one thing in common: they all feature photos of men. Now, a campaign hopes to replace Andrew Jackson's face on the 20 with someone like Susan B. Anthony or Rosa Parks.

"A Cascadic Multigrid Algorithm for Computing the Fiedler Vector of Graph Laplacians" was published in the Journal of Computational Mathematics. It's not Urschel's first paper.

Researchers who helped develop powerful techniques warn that tweaking the genome is now easy. More public debate's needed, they say, before making changes in genes passed from parent to child.

Saturday marked the 50th anniversary of the successful crossing of the Edmund Pettus bridge in Selma, Alabama, a key moment in the civil rights movement. Journalist Ethel Payne was there.

A former taxi driver attacked two TSA agents with wasp spray and a large blade before a sheriff's deputy shot him three times, authorities say. Police say the man has since died, the AP reports.

They remember an early survivor, the crying child, the teenager who wouldn't give up, the woman who had only bananas to eat, people shaking hands again despite the risks.

The U.S. and its international partners continue nuclear negotiations with Iran. NPR's Scott Simon speaks to Yale professor Stephen Carter about Iran's position in the Middle East.

The secretary of state says all sides appear to be getting closer to an agreement, although he acknowledges remaining differences.

Kraft Foods recently announced a massive recall of its macaroni and cheese. The company — and the processed food industry in general — are hitting some stressful times.

A splash of milk for your coffee might pass, but helping yourself to a whole sandwich? Like any controversial office issue, the ethical lines that cut through the fridge aren't so clear.