[img]http://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/AtomicEffects-p26b.jpg/300px-AtomicEffects-p26b.jpg[/img] At the atomic bombing of Hiroshima, "shadows" were burnt into the walls by the flash burn of the thermal radiation from the bomb. [img]http://upload.wikimedia.org/wikipedia/en/d/d3/Soviet_super_test.jpg[/img]