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Think of it like a golf club striking a golf ball. When the clubface hits the ball square, the ball goes straight and heads toward the hole. But when the clubface is rotated a fraction of one degree, the ball's trajectory lands far off course. At impact, the divergence is minor, but as the ball travels further it widens and widens until the gap is so large that getting back on track is nearly impossible. A bad choice can set your trajectory off by only one degree today, but over years the error is magnified.