Andreas Lubitz competes in the Airportrun in Hamburg, Germany, on Sept. 13, 2009. Lubitz, the Germanwings co-pilot, is believed to have deliberately crashed his plane carrying 149 others into the French Alps last week. Michael Mueller/AP hide caption

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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

President Obama, seen here inspecting solar panels on the roof of the Department of Energy, has submitted a U.S. pledge to reduce greenhouse gases. Kevin Lamarque/Reuters/Landov hide caption

itoggle caption Kevin Lamarque/Reuters/Landov

Windsor Castle, home to the British monarchy for hundreds of years, was built by William the Conqueror in the 1070s, according to the monarchy's official website. W. Buss/De Agostini/Getty Images hide caption

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Parts of the subway system were shut down in the city of Bursa when a major power outage hit cities and provinces across Turkey on Tuesday. Anadolu Agency / Getty Images hide caption

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Demonstrators gather outside the City County Building in Indianapolis on Monday, calling for the state House to roll back the controversial Religious Freedom Restoration Act, which critics say can be used to discriminate against gays and lesbians. Aaron P. Bernstein/Getty Images hide caption

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It's a drone delivery! This copter is ferrying medicine from a pharmacy to the headquarters of Deutsche Post in Bonn, Germany, part of a test of drone capabilities. Andreas Rentz/Getty Images hide caption

itoggle caption Andreas Rentz/Getty Images

Not many students have the cutting-edge cybersecurity skills the NSA needs, recruiters say. And these days industry is paying top dollar for talent. Brooks Kraft/Corbis hide caption

itoggle caption Brooks Kraft/Corbis

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

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Noomi Rapace stars as heroine Lisbeth Salander in the Swedish film adaptation of The Girl with the Dragon Tattoo. Nordisk Film/The Kobal Collection hide caption

itoggle caption Nordisk Film/The Kobal Collection

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

At Resource Management's materials recovery facility, workers pull plastic bags, other trash and large pieces of cardboard off the conveyor belts before the mixed single-stream recyclables enter the sorting machines. Véronique LaCapra/St. Louis Public Radio hide caption

itoggle caption Véronique LaCapra/St. Louis Public Radio

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