Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers' strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach - RTX1CG3R

Children play in the garden of their kindergarten run by a private foundation which is not affected by the nursery caretakers’ strike in Hanau, 30km south of Frankfurt, Germany, May 11, 2015. Most of the kindergartens run by public services all over Germany face a strike of the nursery caretakers as they fight for higher wages and better working conditions. REUTERS/Kai Pfaffenbach – RTX1CG3R