John Hersey's famous article in The New Yorker on 31 August 1946.
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What it was really like, and sadly the threat is still there for all of us.
During the 1960s, I remember waking up with a start one morning when a very bright light shone upon me, and I thought that a nuclear weapon had been exploded over Melbourne. It turned out only to be the morning sunlight streaming through a small gap in the curtains, but that experience has been with me ever since.