"There once was a man who feared his own shadow and who hated his footprints and tried to escape from them. The more he lifted his feet, the more tracks he made. As fast as he could go, his shadow remained with him. Thinking he was still going too slow, he streaked like an arrow until all his strength was spent, and he died. He didn't realize that sitting in the shade of a tree would do away with his shadow, and living quietly would leave his traces to fade away." --Chuang Tzu

The dangers and effects of nuclear, earth-penetrating weapons