HIROSHIMA -- A group of American teenagers sat in a circle in rapt silence, listening to a 72-year-old Japanese woman speak.

"Remember, that was war," Michiko Yamaoka said Saturday at a public hall in Hiroshima. "I want children in the world to know that."

The survivor of the 1945 atomic bombing here has told her experiences to high school students from the United States every year since 1986 to inform them of the horror of nuclear weapons and persuade them that war is irrational.