The essence is that small changes in the start of a system can cause big variations at the end.
Imagine rolling a marble along the ground. On a firm even surface you can pretty much predict where it will go based on where you roll it from, and if you roll it again from one inch to the left with the same power you can expect it to end up one inch left from where you rolled it last time. But add some bumps, dips, valleys, grease, sand, etc, to the ground, and rolling the marble from a slightly different spot or with slightly different strength means it will end up somewhere you wouldn’t expect based solely on the difference in that initial roll.
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