Bernie Sanders and Hillary Clinton participate in the PBS NewsHour Democratic presidential candidate debate Thursday at the University of Wisconsin, Milwaukee. Win McNamee/Getty Images hide caption

toggle caption Win McNamee/Getty Images

The Smithsonian is sharing images of astronaut graffiti aboard the Apollo 11 command module, including this tribute to the spacecraft. Smithsonian Air and Space Museum hide caption

toggle caption Smithsonian Air and Space Museum

FBI agents close a stretch of road near the Malheur Wildlife Refuge Headquarters on Thursday. The FBI surrounded the last protesters holed up there amid reports they will surrender. Rob Kerr/AFP/Getty Images hide caption

toggle caption Rob Kerr/AFP/Getty Images

Christine Ristaino, with her son, Benny Smith, on a recent visit with StoryCorps. StoryCorps hide caption

toggle caption StoryCorps

Bernie Sanders told supporters after winning the New Hampshire primary, "The American people bailed out Wall Street; now it's Wall Street's time to help the middle class." J. David Ake/AP hide caption

toggle caption J. David Ake/AP

Cliven Bundy stands along the road near his ranch after speaking with media in Bunkerville, Nev., on Jan. 27. His sons led the occupation of the Malheur National Wildlife Refuge in Oregon, and he was arrested Wednesday on charges stemming from a 2014 standoff with federal agents. John Locher/AP hide caption

toggle caption John Locher/AP

A reconstruction of a Neanderthal man (right) based on skull found at the La Ferrassie rock shelter in Dordogne Valley, France. He's face to face with a male Homo sapien. Philippe Plailly & Atelier Daynes/Science Source hide caption

toggle caption Philippe Plailly & Atelier Daynes/Science Source

NPR thanks our sponsors

Become an NPR sponsor