Кратко на пересказать бредбери "и грянул шторм" !

A time machine can send a person to the past. Today, hunting for dinosaurs. But everything is very complicated. Kill that dinosaur, who, without them, must perish in a minute. For the safari a path is laid, which soars in the air, does not touch any tree, flower, blade of grass. You can not leave the trail under any circumstances. The conductor explains that by crushing a mouse, breaking the entire life chain for a million years, the history of mankind will change. Eckels, who paid for a trip to the past, was frightened of dinosaurs and, going into the time machine, got off the trail. Returning to the ground, the travelers found that Eckels had trampled the butterfly. Life in the state has changed (the president came to power, which yesterday lost the elections.) And the thunder struck.
Another option: Eckels, an amateur hunter, for a lot of money goes on a safari in the Mesozoic era, along with a few more hunters. However, hunting for dinosaurs is harsh: you can kill only the animal that must be killed without it (for example, killed by a broken tree), and when you return, you must destroy all traces of your stay (including pulling out bullets from the body of the animal) , So as not to make changes in the future. People are on an anti-gravity path so as not to accidentally hurt even a blade of grass, as this can bring unpredictable shocks to the story. Head of Safari Travis warns:
Crush the mouse with your foot - this will be tantamount to an earthquake that distorts the appearance of the whole Earth, will radically change our destinies. The death of a cave man is the death of a billion of his descendants, strangled in the womb. Maybe Rome will not appear on its seven hills. Europe will forever remain a deaf forest, only in Asia will flourish a lush life. Step on the mouse and you will crush the pyramids. Step on the mouse - and you leave on Eternity a dent the size of a Grand Canyon. There will be no Queen Elizabeth, Washington will not cross Delaware. The United States does not appear at all. So be careful. Stay the trails. Never go out with her!
During the hunt, Eckels, having seen the tyrannosaurus, falls into a panic and descends from the path. After returning at the time, hunters suddenly discover that their world has changed: another spelling of the language, the dictator is in power instead of the liberal president. The cause of this catastrophe immediately turns out: Eckels, having got off the trail, accidentally crushed a butterfly. Travis raises his gun. The fuse is clicked. The last phrase repeats the title of the story: "... and thunder struck."