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# A mystery

- Who ?
- What ?
- When ?
- Where ?
- Why ?

You probably wonder about Why. Isn't it useful?

Understanding Why is really good. I encourage it. But sometimes even the original programmers don't understand why something works, or doesn't work.

(Shhhh, don't tell them I let on. They like to pretend they understand everything.)

You'd be amazed at how often you can fix bugs without really understanding why they happen.