WARSAW, Poland (AP) — Presidents and Holocaust survivors and their descendants are commemorating the 80th anniversary of the Warsaw Ghetto Uprising on Wednesday with a poignant sense that the responsibility for carrying on the memory of the Holocaust is passing from the witnesses to younger generations. The anniversary honors the hundreds of young Jews who took up arms in Warsaw in 1943 against the overwhelming might of the Nazi German army. There are no surviving fighters still alive. Marek Edelman, the last surviving commander, died in 2009. He remained in Poland and helped keep alive the memory of the revolt...