They each turned a moment of violence into a call to action. For James Brady, that moment came when he was shot and wounded by a would-be presidential assassin. For Chung Eun-yong, it was the killings of his two children during the Korean War.Brady took up a personal campaign for increased gun control after surviving a head wound when a man tried unsuccessfully to kill President Ronald Reagan, for whom Brady was press secretary. Chung began a years-long quest for justice, which eventually prompted the U.S. Army to acknowledge having killed civilian refugees at No Gun Ri.Brady and Chung, who died within days of each other in August, are among the notables who left the world in 2014.Others included political figures who catalyzed war and peace and scientists who changed our lives. And we lost beloved entertainers, some remembered for bringing audiences decades of smiles and tears and others who left the stage long before their time.Among the political figures who died in 2014 was Ariel Sharon a hard-charging Israeli general and prime minister whose efforts to reshape the Middle East caused some to call him a war hero and others a war criminal. Another was Marion Barry, the former Washington, D.C., mayor whose accomplishments were often overshadowed by his arrest for drug use.British politician Tony Benn, former Boston Mayor Thomas Menino, Polish leader Wojciech Jaruzelski and former Georgia president Eduard Shevardnadze also died this year.Among scientists and innovators was Rostislav Belyakov, the chief designer of the Russian MiG fighter jets, Nobel Prize winner Martin Perl, who discovered a subatomic particle, and S. Donald Stookey, the inventor of Corningware.