"We must try as best we can to balance isolation and engagement, pressure and incentives, so that human rights and dignity are advanced over time," Obama said five years ago, accepting the Nobel Peace Prize. Mark Wilson/Getty Images hide caption
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Many Stories, One WorldAndreas 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
South African comedian Loyiso Gola performed at The Orbit, a club in Johannesburg, in February. Joao Silva/The New York Times hide caption
Trevor Noah, 31, will become the new host of The Daily Show later this year. Comedy Central hide caption
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
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
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