On the anniversary of the Hiroshima bomb I want to share a short thread. In 2015 I met 81-year-old Tetsushi Yonezawa on the 70th anniversary of the “pika-don”. Aged 11 he was on a crowded streetcar holding his mother’s hand when the bomb struck at 8:15am He was surrounded by people when the glass blew in and the city turned black. He credited the strength of the metal car withstanding the blast to saving his life, and every year he came back to Hiroshima on 6 August to share his story for fear it would be lost.