In Hiroshima, one August morning in 1945 was dark as night – and this woman can’t forget it

For more than 70 years, Setsuko Nakamura has chosen to speak out about the horror she witnessed as a young girl in the hours and days after an atomic bomb rained destruction onto Hiroshima. Her fight for a world free of nuclear weapons has often been maddening, but finally the disarmament activist has something to celebrate