Geophysicists announced this week that they have successfully collected key samples from the site of the asteroid strike that likely wiped out the dinosaurs. Joe Tucciarone/Science Source hide caption

A man in South Korea watches a news broadcast Friday showing file footage of North Korean leader Kim Jong-Un. Speaking at a major gathering in North Korea, Kim declared "great success" in the country's recent nuclear test and a rocket launch. JUNG YEON-JE/AFP/Getty Images hide caption

Neil Leifer took this photograph of sprinter Carl Lewis during the 1984 Olympics. Lewis won four gold medals that year. Photo from Relentless: The Stories behind the Photographs, by Neil Leifer with Diane K. Shah (University of Texas Press, 2016) Neil Leifer/ Courtesy of Sports Illustrated Content Management hide caption

Just like his character Dheepan, Antonythasan Jesuthasan was a separatist fighter in Sri Lanka's civil war. He fled the country and eventually came to France illegally. He's pictured above with Claudine Vinasithamby (Illayaal). Paul Arnaud/Sundance Selects hide caption

People in their mid-40s to mid-60s are more likely than any other group to be prescribed opioids with benzodiazepines. Both kinds of drugs can hamper breathing and mixing them is especially risky. Erwin Wodicka/iStock hide caption

Software coders (from left) William Stevens, Michael Harrison and Brack Quillen work at the Bit Source office in Pikeville, Ky., in February. The year-old firm has trained laid-off coal workers to become software coders. Sam Owens/Bloomberg via Getty Images hide caption