Who are Japan's Nobel Peace Prize winners Nihon Hidankyo? 

STOCKHOLM — Japanese organization Nihon Hidankyo, a grassroots movement of atomic bomb survivors from Hiroshima and Nagasaki who are also known as Hibakusha, won the Nobel Peace Prize on Friday.   Below are some facts about the background and efforts of the movement.   Atomic bombing of Japan    In 1945 the United States dropped two atomic bombs on Japan to bring an end to World War II and avoid a hugely costly invasion of the Japanese home islands.   The two bombs killed an estimated 120,000 people in Hiroshima and Nagasaki...