Sometimes you encounter such natural phenomena that are striking in their unusualness, seem mysterious and inexplicable. The sky above you is suddenly colored with a bizarre play of colors. Either a fiery cross hangs in it, a bloody sword, or several dazzling suns flare up at once. The fireball bursts into your apartment and, walking around the rooms, disappears without a trace, or it can explode with a roar, hitting everything around. Or, as if from a cornucopia, gold coins, oranges, frogs begin to fall from the sky. In newspapers and magazines, you have repeatedly read that for centuries the sleeping mountain giants suddenly begin to spew a fiery, molten mass...