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Randall is a theoretical physicist and professor at Harvard. In 2007 she was named one of the 100 most influential people by Time. She's recently written a book called Dark Matter and the Dinosaurs.

Those arrested include Spanish Monsignor Lucio Vallejo Balda and Francesca Immacolata Chaouqui, who served on the pope's special commission on economic reform.

On a famous shopping street in Paris, children climb up to gaze at Christmas displays in shop windows. But inside these venerable stores, security is a top concern.

The writer, whose Between The World And Me was the winner of this year's National Book Award in nonfiction, talks about his process and the classmate and friend to whom he dedicated the award.

The residents of Bamako, Mali, are in shock after Friday's deadly terrorist attack on a hotel, for which an al-Qaida linked group has claimed responsibility.

In Sao Paulo, home to 20 million people, water shortages have become part of daily life. Some residents are leaving for lusher regions. Ecologists say Amazon deforestation may be affecting rainfall.

At the close of an Asian summit in Malaysia, President Obama vowed to destroy ISIS on the battlefield, while also saying that the most powerful tool was to show ISIS "that we're not afraid."

President Obama called on the United States not give in to fear and discriminate based on religion. "That wouldn't just be a betrayal of our values, it would also feed ISIL's propaganda," he said.

Security continues to be a hot topic in politics as Donald Trump again makes controversial statements this weekend. NPR's Domenico Montanaro gives us the latest on what GOP voters think as well as an update on the upset in the Louisiana governor's race.

Walker, the young son of actors Taye Diggs and Idina Menzel, inspired his father to write a book about a day in the life of a mixed-race child.