A Sound of Thunder

by Ray Bradbury
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In the story "A Sound of Thunder," what small cause leads to what enormous effect?

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In this story, the main character, Eckles, and some other men go way back into the past to go hunting for a Tyrannosarus Rex.  They have to be extremely careful so as not to do anything that will change history.  For example, they can only walk on a given path...

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In this story, the main character, Eckles, and some other men go way back into the past to go hunting for a Tyrannosarus Rex.  They have to be extremely careful so as not to do anything that will change history.  For example, they can only walk on a given path and they have to only kill a dinosaur that they know is going to die in a moment anyway.

But Eckles panics and runs off the path.  He apparently steps on a butterfly when he does this.  This causes enough changes in history that, when they get back, the US has been taken over by a fascist government.

So small cause = dead butterful; big change = America becoming fascist.

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