Seventy years have passed since the United States shocked the world by dropping atomic bombs on the Japanese cities of Hiroshima and Nagasaki. Sunday's thousand-strong rally in Manhattan against nuclear weapons was led by a trio of women in wheelchairs, slowly making their way along the mile-and-a-half route. People at a distance saw the mushroom cloud and heard a thunderous roar. Japan is famous for having the world's oldest population, but supporters of the hibakusha warn that the health effects of a nuclear attack likely will shorten their lives. Later, waiting for an elevator to go up one floor, a chain of origami peace cranes around his neck, Taniguchi declined an interview request. The program director for a project called Hibakusha Stories said this year will be the last to bring survivors to speak at New York City schools, "because frankly, it's concerning bringing so many elderly people together." Pain and shame around radiation exposure at Hiroshima and Nagasaki lifted slowly in Japan, inhibiting public discussion. Hibiki Ouchi's grandfather was a Hiroshima survivor who later died of skin cancer, but no one told her his story until a few years ago, when her mother got breast cancer and worried that it was because of the bomb.