There’s an old song my parents used to sing to me that illustrates the butterfly effect pretty well:
For want of a nail, the shoe was lost
For want of a shoe, the horse was lost
For want of a horse, the rider was lost
For want of a rider, the message was lost
For want of a message, the battle was lost
For want of a battle, the war was lost
And all for the want of a horseshoe nail!
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