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1. How you die: Immediately From the fireball the centre of which is an unimaginable heat of several million degrees Centigrade. You either vaporise or carbonise. From the shock wave which travels at supersonic speed and kills with falling buildings and flying objects such as glass, masonry, metal pieces etc. From the intense flash of heat radiation which causes lethal burns. A one-megaton nuclear bomb (a small one by todays standards) will cause lethal burns for anyone out-doors within a 75 square kilometre area of the explosion.