The Allen Institute for Brain Science hosted its first BigNeuron Hackathon in Beijing earlier this month. Similar events are planned for the U.S. and U.K. Courtesy of Allen Institute for Brain Science hide caption

itoggle caption Courtesy of Allen Institute for Brain Science

A police officer is silhouetted through the emergency room door at a public hospital in San Pedro Sula, Honduras. With 91 murders per 100,000 people, the Central American nation is often called the most violent in the world. The homicide rate is roughly 20 times that of the U.S. rate, according to a 2011 U.N. report. Esteban Felix/AP hide caption

itoggle caption Esteban Felix/AP

About twice a year, statistics suggest, a pilot somewhere in the world — usually flying alone — deliberately crashes a plane. The Germanwing flight downed last week may be one such case. But most people who fit the psychological profile of the pilots in these very rare events never have problems while flying. Patrik Stollarz/AFP/Getty Images hide caption

itoggle caption Patrik Stollarz/AFP/Getty Images

An FDA field inspector in Los Angeles checks imported shrimp, February 2009. More than a dozen federal agencies play a part in keeping food from making Americans sick. Critics say that leads to a lack of coordination, a patchwork of rules and holes in the system. FDA hide caption

itoggle caption FDA

There's a widely held assumption that a slight imbalance in male births has its start at the very moment of conception. But researchers say factors later in pregnancy are more likely to explain the phenomenon. CNRI/Science Source hide caption

itoggle caption CNRI/Science Source

NPR senior Washington editor Beth Donovan walks on a treadmill desk in her office in Washington, D.C. Meredith Rizzo/NPR hide caption

itoggle caption Meredith Rizzo/NPR

Olympic gold medalist Sanya Richards-Ross pulls on compression sleeves before a 400-meter race at the World Indoor Athletics Championships in Istanbul in 2012. Martin Meissner/AP hide caption

itoggle caption Martin Meissner/AP