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http://en.wikipedia.org/wiki/Butterfly_effect

In chaos theory, the butterfly effect is the sensitive dependence on initial conditions, where a small change at one place in a deterministic nonlinear system can result in large differences to a later state. The name of the effect, coined by Edward Lorenz, is derived from the theoretical example of a hurricane's formation being contingent on whether or not a distant butterfly had flapped its wings several weeks before.

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回復 22# ayako

I don't think it's a problem to look back. We learn from mistake/experience. There are something that we can look back and learn that we can make a different decision back then.
There are others that we can look back, think about it and just know that being myself, I will just make the same choice. It's part of learning who we are.

Thanks for sharing.