A teacher and GEW trade union member with a sign that reads "I am so angry" blows a whistle as he takes part in a Germany-wide strike of public sector workers in Berlin March 11, 2015. German schools, kindergartens, hospitals and some regional airports were hit by strikes on Wednesday ahead of a third round of wage talks between trade unions and state officials. The trade unions are demanding a 5.5 percent pay rise for some three million civil servants in Europe's biggest economy. REUTERS/Stefanie Loos (GERMANY - Tags: BUSINESS EMPLOYMENT POLITICS CIVIL UNREST)