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"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.

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

An HBO documentary about Scientology, Going Clear, won't be released in Britain. Neither will the book on which it's based. That's because British and U.S. free speech protections are very different.

Former NPR audio engineer Bill Deputy died over the weekend of lung cancer. He understood how sound could create pictures — pictures as vivid as any painting and as clear as any photo. He was 58.

Twelve ex-educators are accused of changing students' test scores in a scandal dating back to 2009. Jurors have six months of evidence to go through, including testimony from more than 130 witnesses.

Texas Sen. Ted Cruz announced his presidential bid Monday on Twitter. If the early campaign trail is any indication of how 2016 will go, the staunch conservative will be exactly who he's always been.

For two years, the zoo said Luka was a male when the bear was really a female. The zoo explained that it's difficult to identify the sex of juvenile Andean bears.