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Perseverance can be trained. In fact, I think that's probably the only way to get it.

As for curiosity, I don't think I've ever met a child who wasn't born with it. The goal there might have to be to avoid anything that would cause a child to unlearn it.

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Too much curiosity can be dangerous. As I child, I constantly opened electrical devices to see how they worked internally, resulting in several 230 V shocks (the notion of alternating current instantly made sense to me in 8th grade, because you feel the line frequency as an extreme vibration in the hand when you get shocked). My wife stuck a plastic toy into an outlet as a child to see if plastic really was a bad conductor. The toy had some glitter paint on it, and apparently, that paint was a good conductor.

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