Media wait at a checkpoint about 4 miles from the Malheur Wildlife Refuge Headquarters near Burns, Ore., as the sun rises on Thursday. The FBI had surrounded the last four protesters holed up at a federal wildlife refuge in Oregon and were waiting for them to surrender. Rob Kerr/AFP/Getty Images hide caption

toggle caption Rob Kerr/AFP/Getty Images

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

A simulation shows gravitational waves coming from two black holes as they spiral in together. S. Ossokine , A. Buonanno (MPI for Gravitational Physics)/W. Benger (Airborne Hydro Mapping GmbH) hide caption

toggle caption S. Ossokine , A. Buonanno (MPI for Gravitational Physics)/W. Benger (Airborne Hydro Mapping GmbH)

For every $1 that farmers spent on crop insurance premiums over the past 15 years, they got more than twice that much back in payouts, according to a new report. Andrew Baker/Ikon Images/Corbis hide caption

toggle caption Andrew Baker/Ikon Images/Corbis

A woman with a cut on her cheek and trouble seeing with her left eye was admitted to Craig Joint Theater Hospital at Bagram Air Field, Afghanistan. X-rays showed a projectile that surgeons decided to remove. Forbes et al. 2016/Journal of Neurosurgery hide caption

toggle caption Forbes et al. 2016/Journal of Neurosurgery

Belkiz Halip and her children Eye (left) and Zehra fled bombing in Aleppo to a tent city close to the Bab al-Salam crossing on the Turkish-Syrian border. Anadolu Agency/Getty Images hide caption

toggle caption Anadolu Agency/Getty Images

Sen. Ted Cruz, R-Texas, speaks during a campaign stop Tuesday. His third-place New Hampshire finish has largely been overlooked, but he will contend strongly in the coming slew of Southern states. Matt Rourke/AP hide caption

toggle caption Matt Rourke/AP

Russ Finch holds up half of a Cara Cara orange grown in his geothermal greenhouse in Alliance, Neb. Courtesy of Grant Gerlock/Harvest Public Media hide caption

toggle caption Courtesy of Grant Gerlock/Harvest Public Media

Karyn Jackson (right) helped Fernando Rico, of Pasadena, Calif., complete a Covered California application for health insurance at an enrollment fair in 2014. Allen J. Schaben/LA Times via Getty Images hide caption

toggle caption Allen J. Schaben/LA Times via Getty Images

NATO on Thursday ordered a naval force to move immediately to the Aegean Sea to help end the deadly smuggling of migrants between Turkey and Greece. In this photo from last June, a Greek coast guard vessel arrives carrying migrants at the port of Mytilene, Greece, after a rescue operation. Thanassis Stavrakis/AP hide caption

toggle caption Thanassis Stavrakis/AP

Riot police were deployed Wednesday night outside Topo Chico prison in Monterrey, Mexico, where at least 52 people died in rioting and a fire. Francisco Cobos/AFP/Getty Images hide caption

toggle caption Francisco Cobos/AFP/Getty Images