To make it understandable:
An action acts on something and that in turn causes another action.
So all of a sudden you have one action that in turn caused two actions. Say, a ball hitting another ball and that ball hits another etc.
So you want to predict what those other balls do but all of a sudden the equation became two, one for every ball.
And those hit other balls.
And then you have molecular biology and oh shit everything compounds on itself.
Supercomputers take this into account and bear the brunt of it.
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