Education Secretary Betsy DeVos stumbles during her interview with Lesley Stahl on CBS's 60 Minutes. 60 Minutes/Screenshot by NPR hide caption

Professor Eric van Oort uses this 'virtual oil rig' to do research at the University of Texas at Austin. He helps advise companies on how to improve operations. Mose Buchele/KUT hide caption

Police vehicles line up at Marjory Stoneman Douglas High School in Parkland, Fla., after the shooting that killed 17 people last month. Officers were frustrated when the Broward County radio dispatch system seemed to be jammed. Gaston De Cardenas/AFP/Getty Images hide caption

Amina Ahmed at home in Oromo, Ethiopia. Before having cataracts removed from both her eyes, she had been blind for four years. Jason Beaubien/NPR hide caption

Jeanne and Gideon Bernstein, parents of Blaze Bernstein (pictured behind them), speak at a news conference in Lake Forest, Calif., in January. Former classmate Sam Woodward, an alleged neo-Nazi, has been charged with fatally stabbing Bernstein. Amy Taxin/AP hide caption

Pope Francis waves to the crowd in St. Peter's Square on Sunday. Recent months have seen Francis become the target of criticism on various fronts, and his image as a charismatic reformer has suffered some hits. Filippo Monteforte/AFP/Getty Images hide caption

The Navy's new USS Little Rock arrives at the harbor in Buffalo, N.Y., last December. In imposing tariffs on steel and aluminum imports, President Trump said the U.S. military should be as self-sufficient as possible. Carolyn Thompson/AP hide caption

An MIT study tracked 126,000 stories and found that false ones were 70 percent more likely to be retweeted than ones that were true. Matt Rourke/AP hide caption